ADTRAN DSU/CSU User's Manual
Contents
1. gt Test Unit Data Pass Thru Bidirectional loopback Figure 6 TROCU DP Bidirectional Loopback Pass Thru Mode If the TROCU DP bidirectional loopback is invoked after the TRDDS R achieves synchronization the TRDDS R will not pass or receive data from the CPE or DDS test set This is consistent with current DDS testing methods and is referred to as the TROCU DP bidirectional loopback normal mode For testing purposes the installer may choose to initiate the TRDDS R to pass thru mode Once the bidirectional loopback is executed in normal mode unseat and reseat the TRDDS R and allow the unit to train up Once trained the TRDDS R will revert to pass thru mode for further testing Refer to Figure 7 for TRDDS operation during bidirectional loopback in normal mode TROCU DP TRDDS R DSU CSU G Open Loop Bidirectional loopback Figure 7 TROCU DP Bidirectional Loopback Normal Mode 5 REMOTE PROVISIONING AND DIAGNOSTICS Control Protocol Remote access to provisioning and status information is accomplished using ADTRAN Digital System 6 Message protocol defined in Control and Diagnostic Procedures Practice Section 6032991 6 Digital System 6 is supported by the TPI 108 109 and 105 portable test set and is supported by Hekimian React 2001 Release 1 900 remote test system The TRDDS network elements comply with ANSI T1 107 1995 Digital Hierarchy For2. Gauge PULP OF 1 2900 24 Gauge PIC 70F 1 3982 24 Gauge PULP 70F 1 4324 24 Gauge PIC 120F 1 4917 24 Gauge PULP 120F 1 5268 26 Gauge PIC OF 1 6823 26 Gauge PULP OF 1 6751 26 Gauge PIC 70F 1 8568 26 Gauge PULP 70F 1 8469 26 Gauge PIC 120F 1 9718 26 Gauge PULP 120F 1 9608 61291006L2 5B Section 61291006L2 Issue 2 3 As an enhancement to automated testing capability TRDDS eliminates false error indication when invoking NIE CSU or DSU loopbacks immediately following release of OCU loopback TROCU DP Bidirectional Loopback Support The TROCU DP will execute a bidirectional loopback when performing an OCU loopback at the TROCU DP as shown in Figure 5 If the TRDDS R detects a bidirectional loopback during power up synchronization the TRDDS R allows data to pass on the four wire interface by entering into the pass thru mode This allows a standard portable DDS test set connected to the four wire customer interface of the TRDDS R to verify the integrity of the two wire loop by transmitting a test pattern and examining the returning data for synchronization and errors The TROCU DP LBK LED will illuminate solid during an OCU loopback Refer to Figure 6 for an illustration of the bidirectional loopback pass thru mode TROCU DP Intra office Customer G Bidirectional loopback Figure 5 OCU Loopback at the TROCU DP TROCU DP TRDDS R 55 m m l G
3. frequency of 13 3 kHz Listed below are the loop design guidelines for TRDDS See Tables 2 and 4 for more information e All loops must be nonloaded e Actual Measured Loss AML should not exceed 50 dB at 13 3 kHz 135 termination the Nyquist frequency of TRDDS NOTE The 50 dB AML limit includes 6 dB of signal margin to account for potential near end cross talk NEXT from other digital services that may be provisioned in the same binder group e Loop length should not exceed 50 kft e Bridged tap length should not exceed 12 kft e Background noise level should not exceed 34 dBrn e Impulse noise level should not exceed 40 dBm 50 dBrn NOTE Measure noise with 50 kbit weighting characteristic approximating a filter with a passband of 40 Hz to 30 kHz Background noise level or impulse noise level is referenced from 56 64 kbps data rate in TR62310 Table 4 TRDDS Insertion Loss Measurements network TRDDS 13 3 kHz compared to 28 kHz for traditional DDS service Eui 133kHz 28 kHz Configuration 27 kft 26 AWG 50 12 dB 65 35 dB 36 25 kft 24 AWG 50 00 dB 62 50 dB 50 kft 22 AWG 50 24 dB 59 33 dB 61291006L2 5B Section 61291006L2 Issue 2 5 7 WARRANTY AND CUSTOMER SERVICE ADTRAN will replace or repair this product within 10 years from the date of shipment if it does not meet its published specifications or fails while in service see ADTRAN Carrier Networks Equi
4. ADRAN Section 61291006L2 5 Issue 2 June 1999 CLEI Code D4D3MPY_ __ Model TROCU DP Preferred Option Total Reach All Rate DDS Dataport Installation and Maintenance CONTENTS GENERA Decrecer ponien aeaoe ee e EEEE EGEE OPTIONS oreina iid ie aed EE INSTALLATION oniranu nae TESTING vecie eie aoa p ea EEE a aie REMOTE PROVISIONING AND DIAGNOSTICS piran era ERai 6 DEPLOYMENT GUIDELINES sssr 7 WARRANTY AND CUSTOMER SERVICE FIGURES Figure 1 TROCU DP Preferred Option 0 eects Figure 2 Total Reach DDS Circuit Diagram ee Figure 3 Option Switch wo eee ceseceeceseeeeeeeeeeeeenes Figure 4 Rate Selection wo eee cee ceseeeeeeseeeeeeeeeeeeeaes Figure 5 OCU Loopback at the TROCU DP Figure 6 TROCU DP Bidirectional Loopback Pass Thru Mode 0 ceeeeseecesceesceeeeeeeeeeeeeeenes Figure 7 TROCU DP Bidirectional Loopback Normal Mod s cscissevsausetin tes asvienene deuce estrous TABLES Table 1 Preprovisioning cc eeeeeeececseceeeceeeeeeeceneeceneees Table 2 Cable Type Loss Data 13 3 kHz Table 3 LED Indicators 00 ccccccccccecesseceeeeceeseeeeeeeenes Table 4 TRDDS Insertion Loss Measurements A Pw Se 1 GENERAL This practice provides installation and maintenance procedures for the ADTRAN D4 Total Reach Office Channel Unit Dataport TROCU DP Preferred Option The unit is illustrated in Figure 1 Document Revision History Issue 2 of this docu
5. Remote Provisioning and is OFF when operating on manual switches If the channel unit has never been remotely provisioned the AP switch has no effect and the REM indicator remains OFF See Table 3 for LED Indicators Table 3 LED Indicators INDICATOR DESCRIPTION SYNC LOSS _ ON indicates that there is no sync between the TROCU DP and the remote TRDDS R check for continuity load coils and other abnormal line conditions NEAR CRC ON indicates that there are errors on the incoming data stream check for the abnormal line conditions closer to the TROCU DP FAR CRC ON indicates that there are errors occurring towards the remote TRDDS R check for the abnormal line conditions closer to the TRDDS R REM ON indicates that the unit has been remotely provisioned FLASHING indicates that the remote control link is active Push the AP button to toggle between manual and remote provisioning QM DISC ON indicates that the Quality Monitor Disconnect has occurred NO DSU ON indicates the absence of the customer DSU CSU as determined by the TRDDS R ON indicates the OCU or CSU loopback activation LBK IDLE ON indicates the presence of the Control Mode Idle toward the 6 DEPLOYMENT GUIDELINES The TROCU DP and TRDDS R use technology designed to eliminate the need for repeaters and concerns over impairments caused by typical noise and bridge tap Table 2 describes cable loss for the TRDDS Nyquist
6. SU T R Pair Figure 2 Total Reach DDS Circuit Diagram 61291006L2 5B Trademarks Any brand names and product names included in this document are 1 trademarks registered trademarks or trade names of their respective holders NOTE Do not use in SLC 96 Mode II unless unit is provisioned through Digital System 6 NOTE The TROCU DP must be used with an appropriate TRDDS R unit Features In addition to operation over extended ranges the TROCU DP incorporates or supports the following e Two wire deployment e Repeaterless operation e Bridged tap tolerant e Span power for remote TRDDS R termination unit e Utilization in all D4 channel bank and SLC 96 Mode I or III remote terminal applications e NEAR and FAR logic level bantam test access e Loop Quality Monitor and A B signaling options e Embedded Digital System 6 capabilities for remote provisioning configuration and performance monitoring Line Code The ADTRAN TRDDS incorporates Simple Coded Pulse Amplitude Modulation SC PAM a line code that reduces the bandwidth needed to transport signals over copper loops The Power Spectrum Density PSD of SC PAM complies with Basic Rate Interface BRI PSD mask as specified in ANSI T1 601 and is below allowable 2B1Q PSD levels SC PAM increases the deployment ranges and allowable bridged tap lengths when compared to AMI and 2B1Q Additionally SC PAM has an i
7. an open circuit or short circuit condition or load coils see LED Indicators 4 TESTING Testing for the TROCU DP is accomplished using the same test procedures for four wire OCU and OCU DP units Table 2 describes cable loss for the TRDDS Nyquist frequency of 13 3 kHz The TROCU DP is equipped with logic level bantam test access jacks that permit testing in both directions using a portable test set Latching and alternating OCU and CSU loopback sequences are supported Alternating loopbacks do not operate when the 64 kbps data rate is selected Choose NEAR to test toward the customer loop choose FAR to test toward the T carrier In the FAR direction an OCU loopback sequence will loop the unit directly across the T carrier system In the NEAR direction an OCU loopback sequence will loop the unit directly connected to the portable test set NOTE If 64 kbps is selected the unit will only respond to latching loopback sequences Alternating sequences are not valid at this rate Table 2 Cable Type Loss Data 13 3 kHz Plastic Cable dB Loss kft Paper Cable dB Loss kft 19 Gauge PIC OF 0 5302 19 Gauge PULP OF 0 5616 19 Gauge PIC 70F 0 6083 19 Gauge PULP 70F 0 6415 19 Gauge PIC 120F 0 6610 19 Gauge PULP 120F 0 6955 22 Gauge PIC OF 0 912 22 Gauge PULP OF 0 9454 22 Gauge PIC 70F 1 0258 22 Gauge PULP 70F 1 0606 22 Gauge PIC 120F 1 1015 22 Gauge PULP 120F 1 1370 24 Gauge PIC OF 1 2571 24
8. ion Code to the network Customer data transmission is automatically restored when the trouble condition is cleared The Quality Monitor feature is recommended for use on multipoint circuits SC 64 56 19 2 9 6 4 8 2 4 SW56 SW1 gt ON OFF Gj A B Signaling OFF LG Quality Monitor Figure 3 Option Figure 4 Rate Switch Selection Section 61291006L2 Issue 2 61291006L2 5B In lieu of option switches the TROCU DP Preferred Option has been preprovisioned with feature settings as indicated in Table 1 Table 1 Preprovisioning Feature Setting Latching Loopback ON ON Unless 56 kbps SC and Zero Code Suppression 64 kbps OFF Error Correction OFF 3 INSTALLATION The TROCU DP plugs directly into a WECO or equivalent D4 channel bank or the ADTRAN ACT 1900 2300 channel bank No special wiring is required The two wire loop uses the T R Tip and Ring pair pins 24 and 51 of the D4 backplane Span powering is accomplished using 130 V measured from Tip to Ring Voltage measured from Tip to GND should indicate approximately 130 V voltage from Ring to GND should indicate approximately 0 0 V When inserted into a powered up backplane the TROCU DP and TRDDS R will synchronize within 30 to 90 seconds When synchronized the SYNC LOSS indicator LED will turn Off If synchronization cannot be achieved check the T R pair for
9. mat Specifications Annex G which allows remote provisioning querying and performance monitoring via inband control of network elements NOTE The REACT 2001 GUI software Release 1 900 supports ANSI T1 107 1995 Remote access is accomplished using a defined set of inband DSO byte sequences similar to the latching loopback sequence Commands issued through the test system are recognized by the individual channel unit which responds with the appropriate byte sequences These inband commands may be used to verify options via dialogs with REACT 2001 and TPI 108 109 test sets Unit CLEI serial number provisioning and performance information can be retrieved remotely using the Digital System 6 protocol Provisioning and Status All configuration options can be remotely viewed or provisioned The front panel Remote REM LED indicator will Flash during control link establishment and remains ON after the channel unit has been remotely provisioned If the channel unit has been remotely provisioned the operator can alternate between remote configuration 4 Section 61291006L2 Issue 2 61291006L2 5B and manual switch settings by pressing the momentary Alternate Provisioning AP switch located on the front panel If the channel unit is removed from the system the unit retains previous provisioning information in nonvolatile Random Access Memory RAM The REM indicator remains ON when the channel unit is operating based on
10. ment revises the Deployment Guidelines subsection Description ADTRAN D4 TROCU DP Preferred Option is a functional replacement for the D4 OCU DP delivering data at rates up to 64 kbps on a single copper pair Used in combination with the Total Reach Digital Data Service Remote termination unit TRDDS R the TROCU DP can accommodate extended loop lengths eliminating the need for DDS repeaters The TROCU DP span powers the remote TRDDS R located at the customer premise The TRDDS R converts the two wire signal to the Figure 1 TROCU DP Preferred Option traditional four wire Alternate Mark Inversion AMI signal for presentation to the customer The TROCU DP occupies a single channel position in the WECO compatible D4 channel bank or the AT amp T SLC 96 Mode I and II terminal It provides the interface between a DSO timeslot of the T carrier data stream and the two wire metallic loop extending to the customer premises The TROCU DP may interoperate over the carrier system with another TROCU DP an OCU DP a DSO DP a 1 0 DCS or the central office switch The unit can be located in an end office hub office intermediate office or remote terminal digital carrier system see Figure 2 The two wire loop is connected using the tip pin 24 and ring pin 51 on the D4 backplane D4 or SLC 96 Customer Premises 4 Wire Customer Interface 7 n TR 2 Wire Loop TeCariier ocu TRDDS R DSU C
11. mproved spectral compatibility when compared to AMI and 2B1Q Sealing Current The TROCU DP provides a constant 10 mA sealing current to the TRDDS R With 10 mA sealing current and span power of 130 Vdc ADTRAN s TRDDS system is in the A3 Class as specified in Bellcore TR NWT 001089 Standard for Electrical Safety for Network Telecommunications Equipment 2 OPTIONS Select the appropriate OPTIONS and RATE using SW1 and faceplate switches as illustrated in Figure 3 and Figure 4 CAUTION Select only one option rate Rate is selected on faceplate switch SW2 by pushing one or two switches to the right toward the inscribed rates If either SW56 or 64 is selected the secondary channel SC switch may not be selected A B Signaling When A B Signaling SW1 1 is OFF the unit derives signaling from the incoming data stream When A B signaling is ON the unit determines the state of the A and B signaling bits using signals present on the backplane of the channel bank This method assumes that proper signaling has been maintained throughout network tandems and cross connect systems NOTE A B option is only applicable when SW56 is selected otherwise the option is a don t care Quality Monitor When Quality Monitor SW1 2 is ON the unit monitors the incoming two wire loop and four wire customer interface data for errors If excessive errors are detected the unit blocks customer data transmission and sends Abnormal Stat
12. pment Warranty Repair and Return Policy and Procedure document 60000087 10A Contact Customer And Product Service CAPS prior to returning equipment to ADTRAN For service CAPS requests or further information contact one of the following numbers ADTRAN Technical Support 800 726 8663 Standard hours Monday Friday 7 a m 7 p m CST Emergency hours 7 days week 24 hours day ADTRAN Sales 800 827 0807 ADTRAN Repair CAPS 256 963 8722 Repair and Return Address ADTRAN Inc CAPS Department 901 Explorer Boulevard Huntsville Alabama 35806 2807 6 Section 61291006L2 Issue 2 61291006L2 5B
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