Tran:3512 DSU/CSU User`s Manual:Ch6:3512 Operation
Contents
1. Li Motorola NMS Tail Circuit Figure 6 37 3512 on Private Wire Tail Circuit off a DDS II SC Circuit Parameters not specified below may be set to factory default values Category Parameter UnitA Unit B Unit C Unit D MODIFY DSU Opmode DDS2 DDS2 DDS2 DDS2 Data Rate 56 0 56 0 56 0 56 0 Timing Ext Pl MODIFY PORT P1 Data Sync Ext Sync Ext MODIFY NETWORK _ NC Port Out 3512 Operation 6 45 LDM Tail Circuits 64k A 64 kbps LDM tail circuit off a 64k CC type circuit with the 3512 in LDM mode is shown in Figure 6 38 64 kbps 72 kbps Uni A 64KCC a A it Primary Line 64 kbps 4 kbps 64 kbps Q A J LDM J W Unit C Unit D LDM Tail Circuit Figure 6 38 3512 on 64k Private Wire Tail Circuit off a 64k CC Circuit Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B Unit C Unit D MODIFY DSU Opmode 64kCC 64kCC DDS1 DDS1 Data Rate 64LDM 64LDM Timing Ext Pl MODIFY PORT P1 Data Sync Ext Sync Ext To configure a 64k LDM tail circuit set Opmode DDS1 and Data Rate 64LDM This application is only supported when DTE Con Normal Note Do not set Opmode 64kCC in this application DSU CSU and Port Timing 6 46 3512 Operation Synchronous communication devices require a common timing source to communicate Complex digital networks provide the source within the application DSU Timin2. Category Parameter Unit A Unit B C D MODIFY DSU Opmode DDS2 DDS2 Data Rate 9 6 9 6 NOTE In DDS II SC applications at 56 kbps some data patterns can cause second ary channel errors DDS II service specifies that data must contain a certain density of 1s long strings of consecutive Os are not allowed If necessary the network alters user data to manage 1s density To prevent this the 3512 uses the DDS II SC bit to insert 1s as needed which may affect secondary channel performance Because of the need to manage 1s density 56 kbps DDS II SC applications are not supported 64k Clear Channel 64k CC Service The 3512 supports the 64 kbps Clear Channel 64k CC service as shown in Figure 6 8 This service available for point to point circuits allows data transmission at a line or port rate of 64 kbps With 64k CC network management is available only in the non interruptive modes bitstealing and muxed the bandwidth available to user applications is approximately 63 2 kbps 64 kbps 64 kbps 64 kbps Ey 64 0 3512 f Primary Line Figure 6 9 64kbps Clear Channel Circuit Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Opmode 64k CC 64k CC 3512 Operation 6 13 Time Division Multiplexing TDM 6 14 3512 Operation This section describes time division multiplexing TDM which is available with DDS I DDS II SC and 64k
3. e Restoral timing considerations e Initiating and terminating restoral e Analog restoral always dial e Digital restoral dial and leased The following rules apply to restoral e In muxed modes a network management uses a derived secondary channel e To initiate restoral automatically you must set DDS to Dial Auto e Only the 3512 that initiated the restoral session can automatically terminate it e Bitstealing mode is not supported Restoral Timing Considerations For most restoral applications there should be one clock source for the system The following recommended configurations ensure exactly one source NOTE These recommendations also apply to devices that do not allow external port timing Analog Restoral Timing e With Integral Restoral 1 Set one 3512 to Timing Internal RESTORAL RESTORAL CONFIG so that it derives transmit timing from its internal oscillator 2 Set the other 3512 to Timing Loopback RESTORAL CONFIG so that it derives transmit timing from received data e With A B Restoral 1 Set one 3512 to Timing Internal RESTORAL CONFIG so that it derives transmit timing from its internal oscillator 2 Set the other 3512 to Timing Ext P2 RESTORAL CONFIG This has the effect of setting Port 2 to Sync Ext so it accepts timing on Pin 24 3 Set both devices port and transmitter to Timing External RESTORAL CONFIG 6 28 3512 Operation Digital Restoral Timing The following configurations are
4. Example 1 A local 3512 with Rest Rate 14 4 and remote unit with Rest Rate 12 0 The local unit is configured as follows Channel Rate kbps 1 48 2 2 4 3 2 4 4 2 4 The local unit initiates restoral and negotiates a line rate of 12 0 and its Channel 4 rate changes to 1 2 kbps Example 2 A local 3512 with Rest Rate 14 4 and remote unit with Rest Rate 9 6 The local unit is configured as above The local unit initiates restoral and negotiates a line rate of 9 6 and its channel rates become Channel Rate kbps 1 4 8 2 2 4 3 1 2 4 0 0 Sample SLR Applications A sample point to point digital circuit with integral SLR in a standalone 3512 is shown in Figure 6 24 Normal operation is over the 56 kbps circuit SLR uses a 14 4 kbps dial line An NMS and a NetView manage the system over a secondary channel If the DDS line runs at e Up to 9 6 kbps SLR can restore the entire bandwidth e More than 9 6 kbps SLR can restore a maximum bandwidth of 14 4 kbps Host with NetView A Unit 56 kbps DDS Service Unit B T SLR e e SLR e E I R K NM A x eceso FOIN Ceecece 14 4 kbps 14 4 kbps Motorola NMS Leased Line for regular operation U AE Secondary Channel aaeeei Restoral Line Figure 6 24 Point to Point Circuit Integral SLR Standalone 3512 Restoral parameters not specified below may be set to factory default values Category Parameter Unit
5. 3512 Operation 6 41 Operational Sequence 1 If unit A or B senses a Link Down Out of Service Out of Sync or ABN Station Code on the primary line for the time specified by From DDS it sends a Restoral Needed message to the network manager 2 The network manager sends a Restoral Initiate command to the local unit which initiates a restoral session 3 The 3512s terminate restoral when the timer expires Figure 6 35 shows a point to point digital tail circuit from a Motorola 6250 T1 multiplexer where communication is restored either manually or automatically to an external analog device In this example the 6250 T1 multiplexer provides timing for all restoral transmission both restoral devices Units F and G are set to Timing External In this example e Units A and B run at 9 6 kbps in DDS I Opmode Normal with interruptive network control Both units A and B are set to auto answer e Analog restoral is configured to run at 9 6 kbps Opmode Normal e Both units can auto initiate restoral in response to Link Down or DDS alarms e Both units can auto terminate restoral when the primary line is restored and alarms stop NOTE To automatically initiate restoral From DDS must be set to different options in units A and B to minimize call collisions Motorola NMS DTEs LF fou 9 6 kbps 9 6 kbps 9 6 kbps Unit A Unit B Tl DDS I Local vi x Tooo 3312 e e e e e 9 6kbps H 396xras7 sOy 326XFAsT FH
6. 4800 4688 9600 9487 19200 19040 56000 55200 64000 62400 3512 Operation 6 7 6 8 3512 Operation Point to point and multipoint circuits using Bitstealing are shown in Figure 6 4 A and B If the line rate is 56 0 kbps the DTE port is allocated 55 2 kbps framing and control data use the remaining bandwidth Most synchronous DTEs and devices such as Motorola statistical multiplexers can operate at these nonstandard port rates In this configuration the 3512s provide a non interruptive control channel similar to that of DDS II SC type service Bitstealing mode is available for single channel applications at 64 0 kbps or subrates 55 2 kbps 56 kbps 55 2 kbps Unit A Unit B 7 a DDS I AA fol se Titan fon E Primary Channel Secondary Channel m Motorola NMS A Point to Point Circuit 3512 in Bitsteal Mode 55 2 kbps 56 kbps itA DDS I a a NO Primary Channel S Secondary Channel B Multipoint Circuit 3512 in Bitsteal Mode Figure 6 4 DDS I Derived Secondary Channel Using Bitstealing Parameters not specified below may be set to factory default values Category Parameter Unit A Slave B Slave C Point to Point Circuit Figure 6 4 A MODIFY DSU Data Rate 56 0 56 0 56 0 MODIFY PORT DTE Con BitSteal BitSteal BitSteal Multipoint Circuit Figure 6 4 B MODIFY DSU Data Rate 56 0 56 0 56 0 MODIFY PORT DTE Con MPM BitS
7. In multi tier network management applications buffering complete messages at the 3512 may cause unacceptable secondary channel delay due to the effect of buffering at each tier boundary To address this concern use the NC Mode Passthru option which does not buffer control channel data nor inhibit local data from passing down the DDS line More interruptions occur since each character is passed independently Using an External Multiplexer to Avoid Network Management Delay If there is an external multiplexer on the circuit a multiplexer DTE port can provide an alternate secondary channel to the remote 3512 or second tier transmission devices Figure 6 2 In this configuration the NMS monitors the local 3512 A second NMS connection to a multiplexer DTE port routes NMS polls to the remote 3512 or second tier devices Multiplexer l a Retransmission at tet tS Primary Channel A OO TA Secondary Channel a NMS monitors local 3512 Motorola NMS b Alternate secondary channel to remote 3512 or second tier device Figure 6 2 DDS I Point to Point Network Managed Main Channel Mode Parameters not specified below may be set to factory default values Category Parameter UnitA Unit B MOD IFY DSU Data Rate 56 0 56 0 MODIFY NETWORK NC Retrans Off Off 6 6 3512 Operation F SOC ony Main Channel Transmission Mode Over Multipoint Circuits In a multipoint application Main C
8. The level of network management supported in second tier devices depends on the service type and the tail circuit configuration Not shown is the 3512 TDM operating with DDS II SC type service over the trunk and digital tail circuits Non interruptive network management is supported in point to point and multipoint tail circuits The tail circuits can be private wire limited distance circuits NOTE Second tier 3512s set to DDS II SC mode cannot use external timing options Slips occur unless the first and second tier services have a common clock source Port Analog 1 1 Modem 7 Service Unit A Unit B H Modem J N gt DDS I 56 kbps AEE p 2 gt 4 3512 3512 Digital F Service Primary Channel eae Secondary Channel X Crossover Cable Port to Channel Map ala al a H Motorola NMS N we A Figure 6 22 Tail Circuit Off 3512 TDM Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Data Rate 56 0 56 0 Chn Rate As needed As needed MODIFY PORT DTE Con Muxed Muxed P to CH shown in figure Tail Circuit Off 3512 TDM in Channel Sharing Mode DDS The 3512 TDM in channel sharing mode supports tail circuit applications Figure 6 23 When used with a Motorola NMS network management commands are data interruptive The maximum port rate is 56 kbps
9. by a crossover cable to another DCE device should be set to synchronous external timing Figure 6 42 NOTE When there are multiple tail circuits and multiple ports configured this way the entire circuit must have its timing synchronized to a single master clock Figure 6 42 also shows a common digital multi tier application where a 3512 TDM link supports a back to back tail circuit and a DDS tail circuit from each respective TDM channel The tail circuits can be point to point or multipoint devices When using the 3512 in an LDM environment as a tail circuit only one port may be set to External or Station timing Local Remote Second Tier DDS Network Second Tier Masters Slaves Pins X 9 6 17 _ Local eee Remote Pins 24 PI Transmitter Receiver PI 7 Pi First Tier First Tier 17 Receiver 9 6 Transmitter 15 9 15 Master Slave Pins y 17 iframe A cd a x4 DSU Tim Network Network eceiver 15 Pt 1 Tim SYNC EXT SYNC INT i P2 Receiver Transmitter P2 7 24 Y p Pins X 4 8 17 H Pl Transmitter DSU Timing Network Network Receiver 4 8 15 P1 Data CL SYNC INT SYNC EXT i P2 Data CL SYNC INT SYNC EXT DSU Tim EXT P1 Network Pt 1 Tim SYNC EXT SYNC INT LDM Applications Figure 6 42 External Timing Tail Circuit When a DDS circuit is tailed off another DDS circuit each device connected by a crossover cable to th
10. ee s26xrasr FCs Port 33 S26xmasr Unit C 24 0 kbps U LO Lose J 9 6 kbps Primary Line Secondary Channel oe ececeeee Alternate Line Figure 6 32 Point to Point Muxed Analog External Restoral with NMS Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B DIAL PARAMETERS DDS to Dial Auto Auto Dial to DDS Auto Auto Trm Tmr 4 hrs From DDS 60 INIT PARAMETERS DDS Alarm On On Link Down On On AUTO ANSWER Answer Enable Enable RESTORAL CONFIG DTE Muxed Muxed Timing Ext P2 Ch1 Rate 9 6 9 6 Ch 2 Rate 9 6 9 6 Rest Rate 24 0 24 0 MODIFY DSU Opmode DDS II DDS I 3512 Operation 6 39 Operational Sequence 1 Unit A or B automatically initiates restoral if the link goes down or if an Out of Service Out of Sync or ABN Station Code is present on the primary line for the time specified in From DDS 2 Units C and D train and enter data mode The 3512s change to the restoral rates specified under RESTORAL CONFIG 3 The restoral session is terminated either manually or automatically upon expiration of the timer 4 The 3512s again monitor the primary line and re initiate restoral if necessary Figure 6 33 shows a point to point network managed application where communication is automatically restored to an external Switched DDS device Restoral is automatically initiated when either unit receives a Link Down or Idle In this
11. example e Units A and B run at 56 kbps in DDS I Opmode Normal with interruptive network control on the primary line e Restoral is configured to run at 56 kbps Opmode Normal over a DDS I line e Restoral is set to auto initiate and terminate in either unit when a link goes down or in response to Idles 3 56 kbps Jorel d ka ae P 56 kbps 56 kbps Port 1 DDS I oS Local SS EE ae 3512 Motorola Port 2 ee 23 qe NMS s 12 LocalSW Speeee Oe Remote Eau Ta kbps 56K Device Ery Ew 56 kbps Unit A Unit B Primary Channel 56 kbps Secondary Channel eeeceeeeee Restoral Line Figure 6 33 Point to Point Digital External Restoral with NMS Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B DIAL PARAMETERS DDS to Dial Auto Auto Dial to DDS Auto Auto Rest Type Dig Dig From DDS 60 INIT PARAMETERS Link Down On On AUTO ANSWER Answer Enable Enable Idles On On RESTORAL CONFIG Timing Ext P2 St Ext P2 St Rest Rate 56 0 56 0 6 40 3512 Operation Operational Sequence 1 If the link goes down or if Idle codes are received for the time specified in From DDS Unit A or B initiates restoral 2 While in restoral the network manager monitors only unit A the secondary channel stops operating 3 The 3512s continue to monitor the primary line while in restoral If the line is cleared of the Link Down or Idle condi
12. four ports A DDS II SC 56 kbps point to point circuit with the DTE set at 19 2 kbps is shown in Figure 6 7 Rate adaptation is used to take advantage of 56 kbps tariffs or to obtain unavailable data rates without upgrade costs 19 2 kbps g 72 kbps 19 2 kbps Unit A Pa B P ma AE Primary Channel Secondary Channel Motorola NMS Figure 6 7 DDS II SC Point to Point Muxed Parameters not specified below may be set to factory default values Category Parameter 3512 Unit A 3512 Unit B MODIFY DSU Opmode DDS2 DDS2 Data Rate 56 0 56 0 MODIFY PORT Chl Rate 19 2 19 2 DTE Con Muxed Muxed DDS II SC Transmission Service Multipoint Circuits The 3512 supports a multipoint DDS II SC circuit in Main Channel mode as shown in Figure 6 8 This way you obtain standard DTE rates and non interruptive network management This is similar to the DDS I circuit shown in Figure 6 4 B As with point to point multi tier configurations the secondary channel can be routed to second tier devices Rate adaptation is not supported with this type circuit 9 6 kbps 12 8 kbps Unit A Ld rs e p j DDSI Unit B ga ci tit io 3512 Lon ia 3512 Motorola NMS Jore a Primary Channel Secondary Channel Figure 6 8 DDS II SC Multipoint Circuit 6 12 3512 Operation Parameters not specified below may be set to factory default values
13. receives timing from another device such as a DTE or a DCE connected by a crossover cable Figure 6 41 shows an example in conjunction with network timing External timing may be selected from Port 1 through 4 IMPORTANT External timing operates only when the line rate is equal to or an exact multiple of the rate of the port supplying the timing This precludes the use of the External DSU Timing option when e Opmode DDS II e Opmode DDS I and DTE Con BitSteal e Opmode 64k CC 19 2 kbps Fin 19 2 kbps ae Gea 19 2 kbps area Receiver 19 2 kbps ee lt _ Transmitter 19 2 a 19 2 kbps DSU Timing EXT P1 Network Note LDM applications only Figure 6 41 External Option for DSU Timing DTE Provides Clock Port Timing 6 48 3512 Operation You use the Pn Data parameter k MODIFY main menu MODIFY PORT category to select timing for a 3512 port Synchronous Internal Timing Option This option is most commonly used indicating that the internal clock supplies timing to the port The source specified by DSU Timing supplies DB to the port In simple digital point to point and multipoint data circuits no other port timing arrangement should be necessary Synchronous External Timing Option With this option an external clock supplies timing into a port buffer The device clocks the data from the buffer to the transmitter using the DSU Timing selection Each port that is connected
14. time When terminals contend priority is given to the lowest numbered port DTEs Channel Sharing rt Unit 3 Polled Terminals Sharing Port Channel Channel Port Channel 1 Host 28 1 1 19 2 kbps Os 5 2 2 Computer kbps 3 3 DIE or FEP 4 4 Unit A Unit B Ports 1234 Ports 1234 TDM Channels 1 2 3 4 TDM Channels 1 1 1 2 Port to Channel Map Figure 6 16 Mixed TDM Channel Sharing Application 6 20 3512 Operation Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Data Rate 19 2 19 2 Ch1 Rate 9 6 9 6 Ch2 Rate 2 4 2 4 P to Ch 1234 1112 MODIFY PORT DTE Con Muxed Muxed Multipoint TDM and MP Mux MP Mux extends the 3512 s multiplex features to enable you to operate several multipoint and point to point applications on one multipoint circuit An MP Mux network consists of one master control DSU CSU and a number of slave tributary DSU CSUs Master and slave devices are connected by multipoint junction units MJUs within the digital network Devices transmit as follows e The master multiplexes data from its DTEs and transmits it over the DDS line to the MJU The MJU broadcasts to the slaves The slaves demultiplex the data to the appropriate DTE ports e Each slave multiplexes data from its DTEs and transmits it over the DDS line to the MJU The MJU combines the data and sends it
15. 512 P4 Ports 1 2 3 4 Ports 1234 Channels 1 23 4 Channels 1 2 3 4 Port to Channel Map Port to Channel Map A Port to Channel Mapping with Same Assignments a Port Channel Channel Port A aie Ml Host B 1 1 2 1 A Co located Computer C 2 D 1 2 C Terminals or FEP D 3 3 3 3 D 4 4 4 4 3512 3512 pri Ports 1 2 3 4 Ports 1 2 3 4 Channels 1 2 3 4 Channels 2 1 3 4 Port to Channel Map Port to Channel Map B Port to Channel Mapping with Different Assignments Figure 6 10 Port to Channel Mapping Assignments Sample P to Ch options for this configuration are shown in the figure The map lets you establish virtual point to point links on a multipoint circuit using MP Mux 3512 Operation 6 15 The 3512 uses port to channel mapping for circuit consolidation as follows e Figure 6 11 A shows a central site 4 port 3512 and remote 1 port devices establishing multiple virtual point to point circuits e Figure 6 11 B shows polling on Channel 1 to both sites and slaves and on Channels 2 3 and 4 to one site 56 kbps DDS I Service Port Channel A 1 1 B 2 2 C 3 3 l Port D 4 4 3512 Ports 1 2 3 4 l Port 3512 a Channels 1 2 3 4 Feu rot A Point to Point Circuit Consolidation Using Multiple 1 Port 3512s at Remote Sites Port Channel G2 mi 1 Port B LA Ch3 Port 1 Eca 3512 4 Port 3512 Channel Port A 1 1
16. 56 SW56 NM Switched eeso Digital ee eee 56 kbps Network J 56 kbps Motorola NMS Leased Line for primary operation e a Secondary Channel eee oee Restoral Line Figure 6 27 Switched Digital Point to Point Circuit Integral Restoral Figure 6 27 shows a point to point restoral circuit with integral SW 56 service at one end and A B restoral at the other Normal operation is over a leased circuit A 3512 with the SW 56 feature can initiate or receive a call from the remote SW 56 device to restore a broken connection NOTE The SW 56 device may run on either a 2 wire or 4 wire service Restoral parameters not specified below may be set to factory default values Category Parameter Unit A Unit B AUTO ANSWER Answer Enable PHONE NUMBER Enter Phone phone number 56 kbps Switched Digital Network a 4 Wire Line SW56 2 or 4 Wire Line Figure 6 28 Switched Digital Point to Point Circuit Mixed Restoral Restoral parameters not specified below may be set to factory default values Category Parameter UnitA Unit B PHONE NUMBER Enter Phone phone number RESTORAL CONFIG Rest Type Digital Switched 56 and Leased 56k Integral Digital Restoral An integral digital leased line restoral application on a point to point circuit is shown in Figure 6 29 Motorola NMS 56k DDS Front End Processor eoecece eoeecee 56
17. 6 35 External A B Restoral Analog and Digital 0 0 eee eeeeeceeneceeeeeeees 6 36 External Restoral Tips and Considerations ssissririsssissssureisssononrsnnis 6 36 External KRestoral Sample Appicanans ssresssrmeramesonianimii 6 38 3512 Operation 6 1 Chapter 6 6 2 3512 Operation Contents Continued Limited Distance Modem L DM Private Wire Applications ee LDM Timing Considerations lt cisscivesassiascaisiauesvsisszensscteassscssvaveck bess sacoes Tail Circuit Considerations icc ccusssesanevecoanisineonaennd ebasineviie bane satadesconseences LON Teal C memts DDS al rnana E LOM Tat cunts DDS SC rennen ee NEE r erii LOM Tal Creus GIE orrena A DSU CSU and Port Timing DSU Timing Options Network Pinte OPON ermesinin eanan eaei Internal Timing Option External Timing OPUN ss ase hs cat ccseitie ad eae vtca tesla ls ea ee aSeaes Port Taming scsi Synchrono us nternal Timing OPUN j2i ss ccsccrssvecesvvas cceddue rds wen ciowustecons Synchronous External Timing Option ciscasscesscsssescerssseasssaszocersiaeeunwanews Synchronous Station Timing Optom yc ssce cscs ssc cncesastecoans bees tone ebesitentee es Asynchronous Data Timing Optio siveccscasci seas secsscvesviossvinssicevsiaaeivesens Introduction This chapter describes how to configure the 3512 DSU CSU to address your application requirements most effectively Configuring applications requires familiarity with front panel operatio
18. 9 6 kbps Primary Channel Unit F 9 6 kbps Unit G Secondary Channel eseese eeo Restoral Line gt Cross over Cable i Figure 6 35 Point to Point Tail Circuit with External Restoral 6 42 3512 Operation Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B DIAL PARAMETERS DDS to Dial Auto Auto From DDS 60 Dial to DDS Auto Auto INIT PARAMETERS DDS Alarms On On Link Down On On AUTO ANSWER Answer Enable Enable RESTORAL CONFIG Timing Ext P1 Ext P2 Operational Sequence 1 If unit A or B senses a Link Down or Out of Service alarm on the primary line for the time specified in From DDS it automatically initiates restoral 2 In restoral the network manager monitors only unit A the secondary channel stops operating 3 The 3512s monitor the primary line if it is clear for the time specified in To DDS restoral is terminated NOTE Only the 3512 that initiated restoral can automatically terminate it either unit can manually terminate it 4 Both 3512s monitor the primary line and re initiate restoral if needed Limited Distance Modem LDM Private Wire Applications In point to point private wire also known as LDM mode the specific application determines the network management method With DDS I operation the 3512 can provide non interruptive network management with the Deriv
19. A Unit B AUTO ANSWER Answer Enable RESTORAL CONFIG Timing Loopback PHONE NUMBER Enter Phone phone number A sample point to point digital circuit with integral SLR in an alternate destination restoral pool is shown in Figure 6 25 This configuration enables you to re route data traffic around a failed node The restoral pool devices can establish a connection to any of the remote devices 3512 Operation 6 31 6 32 3512 Operation Normal operation is over the DDS circuit SLR uses dial lines at 9 6 12 0 or 14 4 kbps A Motorola NMS and a NetView manage the system over a secondary channel Installing standalone 3512s in a Motorola Mini Nest saves space and aggregates power requirements into a single outlet for more information on Mini Nests refer to Chapter 2 Mini Nest LDA 3512 f a D e o oo SLR a 3512 f 3512 eevee SLR e she e Local s ais Remote a 3512 3 SLR Host z with se 3512 NetView ste SLR as Unit B Lacs 3512 l GaN SERI Primary DDS Line Motorola NMS rn Secondary Channel e e o o Restoral Line Figure 6 25 Point to Point Circuit Integral SLR 3512s in Mini Nest Restoral parameters not specified below may be set to factory default values Category Parameter Unit A Unit B AUTO ANSWER Answer Enable RESTORAL CONFIG Timing Loopback PHONE NUMBER Enter 1 phone number An appli
20. B 2 p 56 kbps DDS I Service G 3 3 l Port 3512 D 4 4 Port 1 Ports 1 2 3 4 Channels 1 2 3 4 B Multipoint Circuit Consolidation Using 1 and 4 Port 3512s at Remote Sites D l Port 3512 Figure 6 11 Port to Channel Mapping with Circuit Consolidation 6 16 3512 Operation Sample P to Ch parameters for this configuration are shown in the figure NOTES 3520 1 You can map Channels 1 8 to ports to accommodate 8 channel 3520s ER 2 In muxed mode without channel sharing you may map any combination of channel numbers to the 3512 s ports you may specify each channel only once 3 With external A B restoral on Port 2 to use channel sharing you must map Port 2 to Channel 2 The 3512 defaults to 0 bandwidth on Channel 2 4 With channel sharing Channel 2 cannot be used in a port to channel map 5 In MP Mux mode the master automatically configures slaves channel rates to equal its own It does so during the training sequence You may assign bandwidth to channels for which no port assignment has been made You may assign more channels than there are ports in the device for example on a 4 port unit you may assign bandwidth to any four of the eight channels 6 Assign unused ports to Channel 0 Table 6 4 shows the relationship between TDM applications transmission services provided and the circuits they support Table 6 4 TDM and Channel Sharing Applications Application S
21. CC service and features that TDM supports e Channel sharing e Port to channel mapping e Multipoint multiplexing MP Mux The next section shows TDM tail circuits private wire point to point applications TDM and Channel Sharing With point to point TDM the 3512 communicates with a mix of DTEs operating at different transmission speeds The DTEs might be multiple ports from a single host computer or front end processor FEP multiple low speed terminals or another DCE device tail circuit A multiplexer on the other end of the line divides the transmissions into component signals and sends them to the terminal ports NOTE TDM uses a small part of the main channel data rate for framing and control functions TDM operates by scanning the unit s device ports starting with Port 1 TDM allocates time slots called channels on the main channel to each DTE interleaving slots to continuously transmit over the line at a rate up to the sum of the separate terminal rates The receiving 3512 distributes the data by time slot to its ports The 3512 also provides channel sharing Channel sharing is sometimes known as port sharing or a modem sharing unit MSU The 3512 e Supports TDM and channel sharing in a number of circuit configurations e Operates as a single or multiple channel unit Channel sharing allocates the bandwidth of a TDM channel among some or all of the 3512 s ports You can configure port rates up to 56 kbps
22. Chapter 6 3512 Operation Contents MBSE eC TN ss sas dee ces steaks vatpegh A ata at pny eateeadas 6 3 System APplCAMONS ss ccesesscessdisszensvedeassessaussii ascervssdadyeeesdecesoaeweesdicesuaacaviceias 6 3 Operating Modes and Network Management Overview ssceseeeeeeees 6 3 DIDS HT SOryite ssascissearsisncavslaseasssesssartenneanscadsenasceusen sien pearsivoousrcssuesvonpavar sions 6 4 Transmission Modes Gyerview scssicccsica trian maestros 6 4 Main Channel Transmission Mode Over Point to Point Circuits 6 5 Main Channel Transmission Mode Over Multipoint Circuits 6 7 Derived Secondary Channel Transmission Mode Bitstealing 6 7 Derived Secondary Channel Transmission Mode Muxed 0 45 6 9 DDS Secondary Channel DDS II SC Services 2 ccssecsscscsrseonssoneee 6 11 DDS I SC Transmission Service on Point to Point Circuits 6 11 DDS II SC Transmission Service Multipoint Circuits eee 6 12 64k Clear Channel 64k CC Seryit sorrires 6 13 Time Division Multiplexing TDM issiria anunn 6 14 TDM and Channel SDaring ese ces uercccs merece tunel avons kniee iiia eeni ia 6 14 TDM and Port to Channel M apping s issrsicrssrriserrsiserserrisesirirserasssonarssoes 6 15 Point to Point TDM on DDS I Type Service siccsrisiioririnrsssriees 6 18 Point to Point TDM amp Channel Sharing with DDS I Service 6 18 Multipoint TDM and Channel Sharing on DDS
23. Data Rate 56 0 56 0 56 0 56 0 Ch1 Rate 19 2 19 2 19 2 19 2 MODIFY PORT DTE Con MPM Mux MPS Mux MPS Mux MPS Mux MODIFY NETWORK NC Address X y Z MODIFYSLV ADDR Slv A Addr x Slv B Addr y Slv C Addr z MP Mux with Mixed TDM and Channel Sharing Figure 6 21 shows an MP Mux mixed TDM channel sharing environment with four applications P Q R and S e P a multipoint application extending to Remote Sites 1 and 2 uses Channel 1 At Site 1 DTEs on Ports 1 and 2 share Channel 1 At Site 2 a DTE is on 3512 Port 3 e Q a point to point application extending to Remote Site 1 uses Channel 2 e R a multipoint application extending to Remote Sites 2 and 3 uses Channel 3 At Site 2 DTEs on Ports 1 and 2 share Channel 3 At Site 3 DTEs on Ports 1 and 2 share Channel 3 e S a multipoint application extending to Sites 1 and 2 uses Channel 4 At Site 1 a DTE is on Port 4 At Site 2 a DTE is on Port 4 P Channel Sharing p Q Unit A seal m DDE 56 kbps 2 k Tt Ports 1 2 3 4 4 47 Q TDM Channels 1 1 2 4 Port to Channel Map Ports 1 2 3 4 i Site 1 Unit B S TDM Channels 1 2 3 4 Port to Channel Map Channel Sharing R i Unit cay aS Sm Ports 1 2 3 4 mene saf z P TDM Channels 3 3 1 4 l Port to Channel Map i Site 2 Unit C 5 i Channel Sharing ih Unit R yt Ports 1 2 3 4 TDM Channels 3 3 0 0 Pr
24. For details on tail circuit timing refer to DSU CSU and Port Timing Port Analog 1 Service AA DDS 56 kbps x 2 n f Jorel4 l 3512 f 3512 12 Digital r Service l 3 4 any Primary Channel Pref Secondary Channel Motorola NMS Crossover Cable Port to Channel Map 1 1 1 1 Figure 6 23 Tail Circuit Off 3512 TDM Channel Sharing Mode DDS Parameter options for the setup in Figure 6 23 are the same as those for Figure 6 22 except for P to CH which is 1111 Tail Circuit Off 3512 TDM in Channel Sharing Mode DDS II SC With DDS II SC type service the carrier provides a secondary channel for network management The maximum port rate is 56 kbps NOTE Second tier 3512s set to DDS I SC mode cannot use external timing options Slips occur unless the first and second tier services have a common clock source DDS II SC service applications may be configured as shown for DDS I in Figure 6 23 The level of network management supported in the second tier devices depends on the service type and the tail circuit configuration This ends the discussion of TDM on DDS I and DDS II SC type circuits The next section addresses restoral operation on the 3512 3512 Operation 6 27 Restoral Operation This section explains the 3512 restoral features which enable the 3512 to continue to operate in the event of DDS line failure
25. II SC Type Service 6 19 Mixed TDM Channel Sharing Applications sssicscssissssisissrossssisrssvscsess 6 20 Multipoint TOM and MP MUK posisine in beaten ratueaioas 6 21 MP Mux with Non interruptive Network Management eee 6 22 MP Mux with Cirenit Consolidaiioti 5 scictciassestcorcnsscesssecdessaurcerven aceon 6 23 MP Mux with Automatic Channel Rate Configuration 0 0 6 24 MP Mux with Rate Adaptation a cieis vast cke sank Susosesngsoutebunce ean eaateauses 6 24 MP Mux with Mixed TDM and Channel Sharing eee 6 25 TOM eri TAL POS assets esi Cease ENAERE wins cena teed ESSEER 6 26 T Crun Gh S302 TOM HG sasrahan 6 26 Tail Circuit Off 3512 TDM in Channel Sharing Mode DDS 1 6 27 Tail Circuit Off 3512 TDM in Channel Sharing Mode DDS II SC 6 27 Berl CTA OW ccs sisventcsnssatssasicnesnareeesanatdesannrectrsgreusi tani EESE EE 6 28 Resioral Timina UC onsideraiOne sc cssccaanccrieanciinnnindeen AE 6 28 Palos Restoral TIMIN sosiete an e a TEE 6 28 Diem Bestoral TIOME ssaranonnnaana a A 6 29 Iiianne and Terminating RestOral sssissccccsneesisomencsnstvnerexivenssenieesssceninss 6 29 Integral Analog Dial Restori mesameasrcnnre are R 6 30 SLR Automatic Rate Nesotiation Feature icc isccescscscteisseitessanssesssnnvenses 6 30 SAMDE SLRANGAN S annn Aa 6 31 kierre Derai REStOrAL seerne enne ENE EEEE 6 34 Weari Diena DIOL Restore sx iiscxcossacccnassiricastioremateans R 6 34 Switched 56 and Leased 56k Integral Digital Restoral
26. L main menu 3 The operator presses mma When Initiate displays the operator presses 4 Unit C dials and establishes a connection with Unit D Communication begins over the analog alternate line at 9 6 kbps 5 When the primary line has been reestablished the operator displays ACTIVATE RESTOR then presses mmm When Terminate displays the operator presses 6 Communication should return to the primary line Figure 6 32 shows a point to point muxed network managed application where communication is restored either manually or automatically to an external analog device In this example restoral is initiated automatically when either unit receives a Link Down or DDS alarm NOTE In this example either unit can initiate or terminate restoral To automatically initiate restoral From DDS must be set to different options such as 15 seconds and 60 seconds in units A and B to minimize call collision In this example e Units A and B run at 56 kbps in DDS II with Ports 1 and 3 configured to operate at 9 6 kbps on the restoral line e Both units are configured for muxed mode restoral NOTE Port 3 cannot be a tail circuit in this type of configuration e Restoral is set to auto initiate in both 3512s when a link goes down or in response to DDS alarms e Restoral is set to terminate either manually or by the timer after four hours NOTE NMS remains in effect when a 3512 initiates restoral al 4 oT b ae
27. S Primary Channel Secondary Channel 9 6 kbps 9 6 kbps B Multipoint Derived Secondary Channel Circuit 3512 in Muxed Mode Figure 6 5 DDS I Derived Secondary Channel Using Multiplexing 3512 Operation 6 9 6 10 3512 Operation Parameters not specified below may be set to factory default values Category Parameter 3512 Unit A SlaveB Slave C Point to Point Circuit Figure 6 5 A MODIFY DSU Data Rate 56 0 56 0 56 0 Ch1 Rate 19 2 19 2 19 2 MODIFY PORT DTE Con Multipoint Circuit Figure 6 5 B MODIFY DSU Data Rate 56 0 56 0 56 0 Ch1 Rate 9 6 9 6 9 6 MODIFY PORT DTE Con MPM Mux MPS Mux MPS Mux MODIFY NETWORK _ NC Address x y z MODIFY SLV ADDR __ Slv B Addr y Slv C Addr z Where x y and z are valid addresses In Muxed mode ports can be set to any standard rate This mode supports up to four DTE ports Table 6 2 shows the maximum rates Table 6 2 Maximum Aggregate Transmission Rates in Muxed Mode Aggregate Port Rate Aggregate Line Rate kbps kbps 1 2 2 4 4 5 4 8 9 0 9 6 18 0 19 2 55 2 56 0 62 4 64 0 DDS Secondary Channel DDS II SC Services With DDS II SC type service the carrier provides bandwidth over the local loop to the digital serving office for a non interruptive network management channel This type of secondary channel is provided on point to point and multipoint circuits Maximum channel and line rates for DDS II SC type servic
28. S I DDS II SC or 64k CC e Network management mode Derived Secondary Channel or Normal e Circuit configuration point to point or multipoint single or multiple tier The following section explains how network management is supported with various services network management modes and circuit configurations 3512 Operation 6 3 6 4 3512 Operation DDS I Service This section describes DDS I type transmission modes configurations and applications The 3512 supports DDS I transmission rates of 2 4 to 56 kbps on point to point or multipoint leased digital lines With DDS I there are three primary modes of network management and control e Main Channel Normal e Derived Secondary Channel BitSteal e Derived Secondary Channel Muxed These modes are independent of the host communications protocol DTE Con MODIFY MODIFY PORT options specify the mode Transmission Modes Overview In Main Channel also known as Normal mode network management information is transmitted over the main channel temporarily interrupting user data Normal mode despite its name should be used only when e Your data terminal equipment DTEs must transmit at a full rate one that exactly equals the line rate e You do not require network management Main channel mode buffers network control commands and network polling data then transmits them at the full line rate In Derived Secondary Channel modes network management information
29. Telephone Network PSTN in the event of primary line failure SLR operates in the V 32 and V 32 bis modes SLR Automatic Rate Negotiation Feature Automatic rate negotiation enables the unit to adapt its line rate to that of another unit It operates as follows during the training sequence at the start of restoral each device transmits its configured line rate the Rest Rate parameter option to the other The initiating device establishes a connection If the Rest Rate values are not equal they use the lower rate For example if a 3512 with Rest Rate 14 4 kbps trains with another at 9 6 the resulting line rate is 9 6 This function lets a 3512 access a restoral pool such as a mix of 14 4 kbps V 32 bis and 9 6 kbps V 32 modems In single channel operations where DTE Con Normal rate negotiation sets Port 1 s line rate in accordance with the negotiated rate In TDM applications DTE Con Muxed rate negotiation subtracts bandwidth from the assigned channels until their aggregate bandwidth matches the available bandwidth Negotiation starts at the highest numbered channel that is assigned bandwidth decrementing in the following steps 14 4 12 0 9 6 7 2 4 8 2 4 1 2 0 It continues subtracting from the highest numbered channel rate until the total bandwidth is less than the restoral line rate If the rate reaches zero without matching the restoral line rate the 3512 selects the next highest numbered channel and subtracts as above
30. Unit C below Set the remote device D to Network e The Data Rate option must be a multiple of the port rate For example if the line rate is 9 6 kbps a port rate of 4 8 or 9 6 is correct LDM Tail Circuits DDS I A 56 kbps LDM tail circuit off a DDS I type 56 kbps circuit is shown in Figure 6 36 The 3512 is set for rate adaptation DTE Con Muxed providing a standard DTE port rate to the tail circuit 9 6 kbps 56 0 kbps Primary Channel Unit A DDS I Unit B Secondary Channel A A M All connections shown are to Port 1 O 3512 k l 9 6 kbps 192 kbps 9 6 kbps 4 Ee _ F 3512 5 0 fore LDM C Unit C Unit D Motorola NMS Tail Circuit Figure 6 36 3512 on Private Wire Tail Circuit off a DDS I Circuit Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B Unit C Unit D MODIFY DSU Data Rate 56 0 56 0 19 2 19 2 CHI Rate 9 6 9 6 9 6 9 6 Timing Ext P1 MODIFY PORT DTE Con Muxed Muxed Muxed Muxed P1 Data Sync Ext Sync Ext MODIFY NETWORK _ NC Port Out LDM Tail Circuits DDS II SC A 56 kbps LDM tail circuit off a DDS II SC type 56 kbps circuit with the 3512 in LDM mode is shown in Figure 6 38 UnitA DDS II SC Unit B Primary Line aI M Secondary Channel 9 3312 3512 F 56 kbps 72 kbps 56 kbps q A A 3512 7 3512 U LDM Unit D J C Unit C
31. arly other devices secondary channel implementation may interfere with the 3512 To avoid interference disable those devices secondary channels In the above application if the circuit is not managed by an NMS and the 3512 is configured for Normal mode NC Restoral must be set to Off If the circuit is managed by an NMS and the 3512 is configured for Muxed then the 3260 s secondary channel must be disabled 3512 Operation 6 33 Integral Digital Restoral 6 34 3512 Operation Integral digital restoral can automatically restore data transmission over 56 kbps DDS I leased line or 4 wire SW 56 service If a line failure occurs as described later in this section restoral can be initiated and terminated as described above Digital restoral is also terminated when the 3512 receives Idles on the alternate line Non interruptive network management is not available For 3512s configured with integral digital restoral when LD Detect Off and the service provider does not supply sealing current the 3512 cannot detect a link down on the restoral line Thus when configured for integral digital restoral set LD Detect On so the 3512 can detect restoral line failure Refer to Chapter 4 Integral Digital Dial Restoral A sample point to point switched 56 kbps SW 56 integral restoral circuit is shown in Figure 6 27 A Motorola NMS operates over a secondary channel yy Host 56 kbps DDS Service prs T SW
32. cation using a mix of 3520s 3512s and 3260s on point to point digital circuits with integral SLR at the remote sites and A B restoral in a Modulus Nest at the central site is shown in Figure 6 26 This configuration enables you to re route data traffic around a failed node Using a Modulus Nest at the central site allows you to mix and match Motorola Modulus products in a single nest This saves space and aggregates power requirements into a single outlet To obtain secondary channel network management in this mixed configuration you must use Muxed mode Regular operation is over the DDS circuit SLR uses dial lines at 9 6 12 0 or 14 4 kbps Unit A Modulus Nest Unit B 56 kbps 3520 __ 8b eee STR eleo 56kbps gt e __3512 gt gt SER Primary DDS Line eccee Restoral Line 3520 Figure 6 26 Point to Point Circuit Integral SLR Modulus Product Mix Restoral parameters not specified below may be set to factory default values Category Parameter Unit A Unit B DIAL PARAMETERS DDS to Dial Man AUTO ANSWER Answer Enable RESTORAL CONFIG Timing Ext P2 Loopback NOTE The 3512 provides a secondary channel when Restoral DTE Normal When Restoral DTE Muxed the secondary channel is multiplexed with the main channel If you are not restoring to another 3512 and DTE Normal set NC Restoral Off since this separate channel may interfere with the main channel Simil
33. depending on the line rate and operating mode Use channel sharing when you have multiple DTEs polled by one application in point to point or multipoint circuits In a point to point circuit channel sharing may be used with e Interruptive network management e Non interruptive bitstealing e Rate adaptation One channel sharing setup can be configured on a 3512 TDM and Port to Channel Mapping Assigning DTE ports to TDM channels forms a port to channel map which specifies how the 3512 handles the DTEs data In port to channel mapping e Each 3512 physical port corresponds to a DTE connector e Each 3512 logical channel corresponds to a TDM time slot Assigning multiple DTE ports to one TDM channel forms a channel sharing unit NOTE TDM Channels 5 through 8 are not shown in this manual although you can 3520 assign ports to them on the 3512 for compatibility with 3520 DSU CSUs Eq Figure 6 10 shows how multiplexing uses port to channel mapping assignments e In Figure 6 10 A applications A through D assign ports to like numbered channels Port 1 is assigned to Channel 1 and so on In Figure 6 10 B at the remote site applications A through D assign ports to different channels Port 1 is assigned to Channel 2 and so on S Port Channel Channel Port A La Host B 1 1 1 1 B Co located Computer C 2 2 2 2 C Terminals or FEP D 3 3 3 3 D 4 4 4 4 3512 3
34. e local device is buffered and processed locally It is not passed out to the DDS I channel to prevent unnecessary main channel interruption Incoming network control data addressed for remote devices is buffered locally and sent as a single message to the remote device s at the DDS I rate This causes one interruption to main channel data for the command and subsequent interruptions for responses If necessary you can further minimize user data interruptions by taking remote units off the NMS poll list Do not do so unless performance is a problem Network management data then interrupts user data only when the unit is specified Using this strategy in point to point configurations circuit or remote device problems cause Out of Service or Link Down alarms to be sent to the master 3512 and the NMS as it polls the master You can then take diagnostic action 3512 Operation 6 5 Using Circuit Assurance and System Status to Monitor Remote Devices In some networks failures at remote units may not have obvious indicators at the master site If Circuit Assurance or System Status is enabled in the remote unit the NMS can get information about the circuit from the local unit Circuit Assurance and System Status cause the remote unit to send only Idles to the master when there is an error condition The master can generate an alarm when it receives Idles for details refer to Chapter 4 Using the NC Mode Parameter to Avoid Network Management Delay
35. e other device should be set to synchronous external timing Both devices DSU Timing should be set to Network refer to Figure 6 39 When both DDS circuits use a common timing source phase differences are absorbed by their buffers IMPORTANT With more than one timing source slips occasionally occur 3512 Operation 6 49 6 50 3512 Operation Synchronous Station Timing Option This option is used for synchronous ports that are connected by a crossover cable to a DCE device that does not support external port timing The DCE device is connected to the 3512 s clock port by a crossover cable and supplies both the transmit and the receive clock Figure 6 43 NOTE The DCE must provide DD and DB in phase for this feature to operate properly 19 2 kbps lt a 19 2 kbps Pin Pin Pin _ gt 17 Receiver 17 24 PI Transmitter ores ae Transmitter Receiver lt 15 i ps 19 2 kbps Does not support external port timing Timing Ext P1 Network P1 Data CL SYNC STA SYNC INT Figure 6 43 Station Timing DDS with Digital Tail Circuit Asynchronous Data Timing Option With this option the network uses synchronous data from the network and DTEs use asynchronous data the 3512s convert the timing Conversion operates with 6 7 8 or 9 data parity bits or any parity and 1 or 2 stop bits do not use 1 5 stop bits Because the DTE and the DCE clocks are different stop bits are shaved when t
36. ed Secondary Channel or Rate Adaptation Muxed Opmode options Rate adaptation provides standard data rates The 3512 can also use Normal mode LDM Timing Considerations In LDM mode independent of service type and not in a tail circuit set the local 3512 to Timing Internal and the remote 3512 to Timing Network MODIFY main menu MODIFY DSU category An internal clock from one 3512 is received at the other device as network timing 3512 Operation 6 43 6 44 3512 Operation Tail Circuit Considerations A tail circuit is any configuration where a 3512 port is connected to another DCE device port Tail circuits include e A 3512 as an LDM private wire circuit off a DDS I or DDS II SC type circuit e DDS I or DDS II SC type circuits off a T1 fractional T1 DDS I or DDS II type circuit When using the 3512 in a tail circuit configuration e A crossover cable between the first and second tier 3512s is required to allow communication between DCEs e Set Pn Data Sync External at the crossover units B and C in Figure 6 36 so that each device uses the other s receive clock for its transmit timing For details refer to DSU CSU and Port Timing in this chapter e Ina DDS I LDM configuration the 3512 can sometimes use clock signals from the crossover cable to clock the entire tail circuit thereby avoiding slips To do this set Timing External Pn MODIFY main menu MODIFY DSU category on the tail circuit crossover device
37. ervice Circuit Available TDM DDS I Point to Point Multipoint DDS II SC Point to Point 64k CC Channel Sharing Normal mode DDS I Point to Point Multipoint DDS II SC Point to Point Multipoint 64k CC Channel Sharing with Rate Adaptation DDS I Point to Point Multipoint DDS II SC Point to Point 64k CC Channel Sharing with Bitstealing DDS I Point to Point Multipoint DDS II SC Point to Point 64k CC Mixed TDM Channel Sharing DDS I Point to Point Multipoint DDS II SC Point to Point 64k CC 3512 Operation 6 17 6 18 3512 Operation Point to Point TDM on DDS I Type Service A 4 port 3512 with TDM in Muxed mode and 56 kbps DDS I type service is shown in Figure 6 12 With this service the 3512 offers aggregate port rates up to 55 2 kbps whether or not the derived secondary channel is required for network management All ports support synchronous rates to 48 kbps and asynchronous rates to 19 2 kbps except 16 8 kbps Synchronous and asynchronous data can be mixed Any port can be configured for either EIA TIA 232 D or V 35 interfaces The available rates are the same with DDS I and DDS II SC type services DDS II SC with TDM provides no advantage over DDS I since a non interruptive management channel is provided in either case 56 kbps 1 Unit A Unit B DDS I r EF a sf E E 2 Primary Channel Motorola NMS Secondary Channel Figure 6 12 Point
38. es are shown in Table 6 3 Data framing and carrier control code requirements account for the differences between aggregate rates and the sums of the primary and secondary rates Table 6 3 Transmission Channel Rates with DDS II SC Type Services Primary Channel Secondary Channel Aggregate Line kbps bps kbps 2 4 133 3 2 4 8 266 6 4 9 6 533 12 8 19 2 1066 25 6 56 0 2667 72 0 NOTE Some data rates may be unavailable in certain digital serving areas or configurations Consult your local carrier for details DDS II SC Transmission Service on Point to Point Circuits A DDS II SC 56 kbps point to point circuit is shown in Figure 6 6 An NMS uses the secondary channel for full time non interruptive circuit and device monitoring In multi tier configurations the secondary channel can be connected from the remote 3512 to second tier network managed Motorola modems and DSUs 56 kbps g 72 kbps 56 kbps Unit A Unit B TT DDS II SC 1 E Ae Primary Channel Secondary Channel Motorola NMS Figure 6 6 DDS II SC Point to Point Circuit Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Opmode DDS2 DDS2 Data Rate 56 0 56 0 3512 Operation 6 11 DDS II SC mode may be used in conjunction with a muxed DTE configuration DTE Con Muxed TDM or channel sharing may be used on up to
39. g Options Timing MODIFY MODIFY DSU options are Network Internal and External This section describes these options On EIA ports timing uses three pins as specified in Table 6 5 You must also specify timing for each active port Pn Data MODIFY PORT Determine the options together based on the network application Table 6 5 EIA Timing Designations EIA Designation Pin Definition Direction DB 15 Transmit signal element timing Output DD 17 Receive signal element timing Output DA 24 External transmit signal element timing Input Network Timing Option This option which sets the 3512 s timing source is in the DDS network must be used with DDS type services Network timing forces the same timing in both directions on a digital transmission path Figure 6 39 DDS Network a 19 2 kb 192 kbps tte 19 2 kbps iansminer 7192 Koo DSU Timing Network Network Figure 6 39 Network Option for DSU Timing Internal Timing Option With internal timing the 3512 generates timing signals In digital LDM back to back applications only set one unit to Internal and the other to Network Figure 6 40 Pin 19 2 kbps Pin 15 A pitas al anne 19 2 kbps merely lt ey ws 19 2 kbps DSU Timing Internal Network NOTE LDM applications only Figure 6 40 Internal Option for DSU Timing 3512 Operation 6 47 External Timing Option With external timing the 3512
40. hannel mode is used primarily for host polling Figure 6 3 The host polls each slave device and one slave uses the channel at a time temporarily interrupting user data You can take remote units off the NMS poll list to minimize interruptions as described above In this case the NMS monitors only the master 3512 NOTE System Status and CQMS functions do not operate in this configuration If the master displays alarms you can test remote devices In this case remote 3512s are insensitive to the NMS unless the entire circuit fails If so an Out of Service alarm occurs een 9 6 kbps Jl Motorola NMS Primary Channel E re Secondary Channel Figure 6 3 DDS I Multipoint Main Channel Mode Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Data Rate 9 6 9 6 Derived Secondary Channel Transmission Mode Bitstealing Bitstealing transmission is available on point to point and multipoint circuits In Bitstealing mode the DTE rate is slightly less than the main channel rate as shown in Table 6 1 framing and secondary channel requirements use a small part of the available bandwidth On a 3512 SDC Bitstealing is available only when P3 Direct For details refer to Chapter 4 COMPRESSION category Table 6 1 Port Rates with DDS 1 Bitstealing Mode Line Rate Available DTE Port Rate bps bps 2400 2290
41. he asynchronous data rate exceeds the 3512 s timing Deleting stop bits and reinserting them at the receiver compensates for this transmit overspeed at port rates up through 19 2 kbps excluding 16 8 kbps The 3512 supports an async overspeed option to accommodate up to a 1 25 clock differential For async 9D the overspeed compensation is 1 1 The 3512 can transmit and receive non supported low speed async applications by setting Pn Data Sync Int and Data Rate at four to eight times the async rate
42. imary Channel pias ard Port to Channel Map Non Interruptive Network Management Channel Site 3 Unit D Figure 6 21 MP Mux for Mixed TDM Channel Sharing Applications Parameters not specified below may be set to factory default values Category Parameter Unit A Slave B SlaveC Slave D MODIFY DSU Data Rate 56 0 56 0 56 0 56 0 Chn Rate As needed As needed As needed As needed MODIFY PORT DTE Con MPM Mux MPS Mux MPS Mux MPS Mux P to CH shown in figure MODIFY NETWORK NC Address x y Z MODIFY SLV ADDR Slv A Addr x Slv B Addr Slv C Addr z 3512 Operation 6 25 6 26 3512 Operation TDM and Tail Circuits Tail Circuit off 3512 TDM Trunk The 3512 TDM supports analog and digital tail circuit applications as shown in Figure 6 22 Timing buffers for each port accommodate phase differences between tiers Inband signaling with DTEs also supported TDM s derived secondary channel for use with DDS I type services supports non interruptive network management Tail circuits can be private wire limited distance circuits For details on tail circuit timing refer to DSU CSU and Port Timing With a tail circuit from one digital network to another occasional data errors may occur when each 3512 derives timing from its digital network and the two networks are not synchronized slight variations accumulate to cause slips In general digital circuits from one service provider with one master clock do not incur slips
43. ion And set the answering device s parameters as follows e Set Auto Answer to Enable NOTE Some vendors devices cannot answer and originate restoral calls 3512 Operation 6 37 6 38 3512 Operation External Restoral Sample Applications In the following examples Unit A and Unit B represent the local and remote 3512s respectively This section also provides suggestions for setting up restoral timing Figure 6 31 shows a point to point application with manually initiated external analog restoral In this example e Units A and B are running at 56 kbps in DDS I with DTE Config Normal e The operator sets 3512 unit A as the originate only unit e The operator designates unit B as the answer unit e Restoral is initiated and terminated manually at a data rate of 24 0 kbps 56 kbps 56 kbps 56 kbps Unit A Unit B DDS I Local Remote O fore sos C e 326x FAST Unit D 24 kbps 7 24 kbps eee e 24 kbps 326x FAST ul i Unit C Primary Line e e e e o Alternate Line Figure 6 31 Point to Point Analog External Restoral Restoral parameters not specified below may be set to factory default values Category Parameter Unit A Unit B AUTO ANSWER Answer Enable RESTORAL CONFIG Timing Ext P2 Rest Rate 24 24 Operational Sequence 1 The operator notices an alarm condition signalling the loss of the primary line on the unit A front panel 2 The operator displays ACTIVATE RESTOR RESTORA
44. is transmitted through Bitstealing or Multiplexing known as muxing over a small separate part of the total bandwidth allowing user data to continue without interruption In derived secondary channel modes the 3512 uses time division multiplexing TDM to maintain the non interruptive network management channel This Mode Operates on And Requires Bitstealing Point to Point Circuits Multipoint Circuits The MP Mux feature and a line rate 9 6 kbps Muxed Point to Point Circuits Multipoint Circuits The MP Mux feature and a line rate 9 6 kbps The following sections describe each of the DDS I transmission modes in detail Main Channel Transmission Mode Over Point to Point Circuits A point to point DDS I application with a Motorola NMS at the local site is shown in Figure 6 1 Network control data uses the NC ports and main channel data uses a DTE port The DTE port rate and the subscribed line rate are 56 kbps 56 kbps ee 56 kbps ii 56 kbps Unit ppi d Unit prl se f Can Hor amp Primary Channel Motorola NMS Figure 6 1 DDS I Point to Point Main Channel Mode Parameters not specified below may be set to factory default values Category Parameter 3512 Unit A 3512 Unit B MODIFY PORT DTE Con Normal Normal MODIFY DSU Data Rate 56 0 56 0 MODIFY NETWORK NC Address x y Where x and y are valid addresses Incoming network control data addressed to th
45. kbps DDS PT Leased Line 56 kbps DDS 1 ceceeoo Restoral Line Leased Line Figure 6 29 Leased 56K Integral Digital Restoral Point to Point Restoral parameters not specified below may be set to factory default values Category Parameter Unit A Unit B DIGITAL CONFIG Call Control DDS DDS An integral digital restoral pool application on multiple point to point circuits is shown in Figure 6 30 3512 Operation 6 35 6 36 3512 Operation Mini Nest Host 3512 pi 3512 pi SW56 sws6 Remote 3512 3512 SW56 3512 3512 sw56 3512 Te SW56 Motorola NMS Unit A n WN lon eco 3512 Unit B Primary Line Secondary Channel e e o o Restoral Line Figure 6 30 Switched 56K Integral Digital Restoral Pool on STAT Mux Restoral parameters not specified below may be set to factory default values Category Parameter Unit A AUTO ANSWER Answer Enable RESTORAL CONFIG Timing DIGITAL CONFIG Call Control DDS PHONE NUMBER Enter Phone Unit B Loopback DDS phone number External A B Restoral Analog and Digital The 3512 supports dial restoral to an external device such as a 326XFAST modem or a Switched Digital Data Service device To initiate A B restoral a multiport 3512 switches the aggregate data channel from the port that is connected to the primary line A to Port 2 usi
46. n and the menu tree structure For more information on Refer to Front panel operation keys and displays Chapter 3 The Front Panel Configuring the 3512 and 3512 SDC Chapter 4 Configuring the 3512 System Applications This section explains some of the primary system applications of the 3512 e Operating Modes and Network Management Overview e DDS DDS D Services DDS Secondary Channel DDS II SC Services e Point to Point Time Division Multiplexing TDM and Channel Sharing e TDM and Port to Channel Mapping e Multipoint Time Division Multiplexing MP Mux Operating Modes and Network Management Overview A Motorola 9300 or 9800 Network Management System NMS enables you to manage entire networks from a single central site This is useful for applications that require integrated management of Motorola communication devices 3500 3512 and 3520 DSU CSUs and 326X analog modems multiplexers and other system devices NMS software enables you to e Configure activate and test communication devices from the central site e Gather and display performance data e Track performance problems and evaluate alternate configurations e Define groups of communication devices to facilitate managing large networks The NMS uses the network control channel which it accesses through the NC IN and NC OUT connectors on a local 3512 rear panel The level of network management and control is determined by e Digital service type DD
47. n lets you save local access charges by installing a single high speed multiplexed DDS I line from the central site to the service provider A multi port multiplexed master 3512 routes data through the carrier office You can configure point to point and multipoint applications on the same circuit Slaves demultiplex the data at remote sites Non interruptive network management is available Figure 6 18 illustrates point to point circuit consolidation and Figure 6 19 shows multipoint circuit consolidation using MP Mux 3512s Sample P to Ch parameters for these applications are shown in the figures 9 6 kbps 3520 8 Port per Channel MP TDM Dy A A 1 1 B 2 2 DDS I 56 kbps C 3 3 Host D 4 4 E 5 5 z 1 Port Port to Channel Application a 512s Map Rate Port to Channel Map Motorola NMS Primary Channel oe Non Interruptive Network Management Channel Figure 6 18 MP Mux for Circuit Consolidation on Multiple Point to Point Circuits 3512 Slave D Application A A B Port to Channel Map Primary Channel SSS non interruptive Network Management Channel Figure 6 19 MP Mux for Circuit Consolidation on Multiple Multipoint Circuits 3512 Operation 6 23 6 24 3512 Operation MP Mux with Automatic Channel Rate Configuration With automatic rate configuration the master device train
48. ng its A B switch The external device B establishes a dial connection The 3512 resumes data transmission through the external device over an alternate line NOTE 3512s cannot fall back to accommodate changes in a dial device s operating rate If the dial device cannot maintain the alternate line data rate and falls back to maintain the connec tion the data is passes will be unreliable and may cause the restoral session to be ter minated Configure the external device so that fallback operation is not supported External restoral cabling is dependent on device type digital or analog Refer to Appendix A for information on cabling for your configuration External Restoral Tips and Considerations For external analog restoral set the external devices as follows e Enable PSTN Cleardown at both V 32 modems e Disable Auto Call Unit ACU e Set the DTE rate to equal the analog data rate e Set Flow Control to Off e Set Speed Conversion to Off e Set DTR to Tail where the modem initiates the dial call on DTR off to on transition drops the call on a DTR on to off transition and answers the call regardless of the state of DTR or to 108 1 if the modem originates only e Configure for Sync Mode and Sync Data typically e Set Timing to External e Set DCD to Low except when in Data Mode e Set RT to Always High e Disable Fallback For external switched digital restoral set device parameters as follows e Dial on a DTR off to on transit
49. over the DDS line to the master The master demultiplexes the data and sends it to the appropriate ports Up to 20 slaves can be attached to one master 3512 A maximum of 64 DTEs can be connected in a multipoint application MP Mux is supported on DDS I type service only in two operating modes e Bitstealing single channel with non interruptive network control channel e Muxed multi channel with non interruptive network control channel 3512 Operation 6 21 MP Mux with Non interruptive Network Management MP Mux allows non interruptive network management of DDS I multipoint circuits Using a bitstealing mode or MP Muxed rate adaptation provides the bulk of avail able bandwidth to a multipoint application while reserving a small portion for net work management Figure 6 17 shows a multipoint application with non interruptive network management To 55 2 Unit A DDS I 56 kbps To 55 2 kbps To 55 2 kbps To 55 2 kbps Motorola NMS Primary Channel e Non Interruptive Network Management Channel Figure 6 17 MP Mux Application with Non interruptive Network Management Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B C D MODIFY DSU Data Rate 56 0 56 0 Ch1 Rate As appropriate As appropriate MODIFY PORT DTE Con MPM Mux or MPS Mux or MPM BitSteal MPS BitSteal 6 22 3512 Operation MP Mux with Circuit Consolidation Circuit consolidatio
50. r Unit A Unit B C D MODIFY DSU Data Rate 56 0 56 0 Chi Rate AS appropriate As appropriate P to Ch 1234 1111 MODIFY PORT DTE Con Muxed Muxed Multipoint TDM and Channel Sharing on DDS II SC Type Service With a carrier provided secondary channel service port rates to 56 kbps are supported with non interruptive network management over a point to point circuit Line rates up to 19 2 kbps are supported over multipoint circuits Figure 6 15 shows multipoint channel sharing with DDS II SC type service 3512 Operation 6 19 12 8 kbps DDS II SC Motorola NMS Primary Channel Secondary Channel Figure 6 15 Channel Sharing with DDS II Multipoint Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B C D MODIFY DSU Opmode DDS2 DDS2 Data Rate 9 6 9 6 P to Ch 1234 1111 Mixed TDM Channel Sharing Applications Port to channel mapping lets you assign multiple DTE ports to one TDM channel A typical application has a host port polling several remote terminals Some DTE ports may be muxed and others sharing channels Figure 6 16 shows point to point mixed TDM channel sharing where both 3512s have multiple DTEs The remote DTEs on Ports 1 through 3 share Channel 1 The remote DTE on Port 4 uses Channel 2 to local Port 2 other channels are not used in this application Here only one terminal port can access the shared channel at any one
51. recommended to ensure only one clock source e With integral digital restoral set both 3512s toTiming Network e With external digital restoral set both restoral devices to Timing Ext P2 St e With switched digital restoral devices set both restoral devices for network timing e With other restoral services set one device for internal timing and the other for loopback timing Initiating and Terminating Restoral If line failure occurs restoral can be initiated as follows e Automatically Based on user defined failure parameters By answering a call By responding to a DTR EIA signal on Port 1 e Manually from the 3512 front panel or a network management system Operation is returned to the primary line in one of three ways e Automatically after user defined criteria have been met and the line has been good for a user specified period of time e After a user specified terminate timer has expired e Manually from the front panel or a network management system By responding to a DTR EIA signal on Port 1 If automatic termination is enabled the 3512 monitors the primary line periodically If it is clear of alarms for a user specified period of time restoral is automatically terminated and data transmission returns to the primary line 3512 Operation 6 29 Integral Analog Dial Restoral 6 30 3512 Operation Integral single line restoral SLR can automatically restore data transmission over the Public Switched
52. s remote slaves as follows once the master s channel rates have been configured the master transmits the rates to slaves Slaves compare their settings with those from the master and if necessary modify their configuration to match the master s This is particularly useful in a circuit consolidation application With a four channel master 3512 at a central site and one channel remote slave 3512s transmitting configuration data from the master saves configuration time and ensures that the data paths are properly configured NOTE For successful training the line rates and Opmode must be set to match the service MP Mux with Rate Adaptation MP Mux provides rate adaptation which lets the 3512 adapt from a higher line rate to a lower DTE port rate providing the cost savings of higher speed digital service Rate adaptation also supports DTE port rates not available from DDS I type service enabling you to make rate upgrades without service upgrade costs Figure 6 20 shows an example 19 2 DDS I 56 kbps kbps lt AEO Master r T l Slave B Slave C 3512 3512 19 2 kbps 19 2 kbps 19 2 kbps Primary Channel Motorola NMS 2 7777 non interruptive Network Management Channel Figure 6 20 MP Mux for Rate Adaptation over DDS I Multipoint Circuits Parameters not specified below may be set to factory default values Category Parameter Unit A Slave B SlaveC Slave D MODIFY DSU
53. teal MPS BitSteal MPS BitSteal MODIFY NETWORK NC Address x y ig MODIFY SLV ADDR Slv A Addr y Slv B Addr ge Where x y and z are valid addresses F SOC only Derived Secondary Channel Transmission Mode Muxed Muxed mode provides a derived secondary channel but maintains standard DTE rates for DTEs that require them With Muxed mode you can multiplex applications and data sources on one line or you can take advantage of favorable digital line tariffs and to obtain unavailable data rates without the cost of upgrading front end ports or other DTE equipment Using Muxed mode this way is known as rate adaptation For example with a 3512 is at 56 0 kbps if an application requires a lower throughput you can configure the 3512 to operate at the lower rate Rate adaptation is supported over point to point and multipoint DDS 1 type circuits Figure 6 5 shows the derived secondary channel obtained with Muxed mode Ports can be configured as channel sharing or time division multiplexing TDM On a 3512 SDC Muxed mode is available only when P3 Direct Refer to Chapter 4 19 2 kbps 56 kbps 19 2 kbps Unit A Unit B z E ay DDS I LE lt p G sa Pofl r Primary Channel Secondary Channel im Motorola NMS A Point to Point Derived Secondary Channel Circuit 3512 in Muxed Mode 9 6 kbps Unit A DDS E E i 56 kbps i NA El m Motorola NM
54. tion for the time specified in To DDS the 3512 that initiated restoral terminates the restoral session Figure 6 34 shows a point to point network managed application with rate adaptation with automatic restoral to an external Switched DDS device Restoral is initiated when either unit receives a Link Down Idle or Telco Loop signal In this example e Units A and B run at 56 kbps DDS II Opmode Normal on the primary line e Restoral is configured to run at 56 kbps over the switched digital line with rate adaptation to maintain a secondary channel Muxed mode allows non interruptive network management control e Restoral is configured to be initiated manually from the network manager in response to an alarm in either unit and to terminate by the timer Foal sor b Motorola NMS ty Local SW 56 kbps 56K Device Unit A Primary Channel Secondary Channel ececeesee Restoral Line Figure 6 34 Point to Point Muxed Digital External Restoral with NMS Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B DIAL PARAMETERS DDS to Dial Man Man Trm Tmr 1 hr From DDS 60 Rest Type Dig Dig INIT PARAMETERS DDS Alarms On On Link Down On On Idles On On Telco Loops On On RESTORAL CONFIG DTE Muxed Muxed Timing Ext P2 St Ext P2 St Ch1 Rate 48 0 48 0 Rest Rate 56 0 56 0 AUTO ANSWER Answer Enable Enable
55. to Point TDM DDS I Type Service Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Data Rate 56 0 56 0 CHn Rate AS appropriate As appropriate MODIFY PORT DTE Con Muxed Muxed Point to Point TDM amp Channel Sharing with DDS I Service The 3512 supports channel sharing applications with contention controlled by the host communication protocol One to four DTEs can contend for the assigned channel 2 4 4 8 9 6 19 2 or 56 kbps Figure 6 13 shows point to point channel sharing in Since all remote DTEs share one channel the port to channel map is 1111 DDS I 56 kbps Primary Channel Motorola NMS Secondary Channel Figure 6 13 Point to Point TDM with Channel Sharing DDS I Parameters not specified below may be set to factory default values Category Parameter Unit A Unit B MODIFY DSU Data Rate 56 0 56 0 Chi Rate As appropriate As appropriate P to Ch 1234 1111 MODIFY PORT DTE Con Muxed Muxed Local Ports 2 3 and 4 are not used in the example Figure 6 14 shows multipoint channel sharing on DDS I service Port 1 Unit A DDS I 56 kbps Motorola NMS Primary Channel Secondary Channel Figure 6 14 Channel Sharing with DDS I Multipoint Parameters not specified below may be set to factory default values Category Paramete
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