Patton electronic 2135 User's Manual
Contents
1. Patton Modems with Router A Ethernet Interface 1 LAN Using Bridge Groups multi V ple remote LANs can be VA bridged over the wide area 51 5 Patton Modems with gt Ethernet Interface gt Figure 2 Transparent bridging between two routers over a serial link 1 TD data output from Ethernet 2 TD data output from Ethernet 3 RD data input to Ethernet 4 no connection 5 no connection 6 RD data input to Ethernet 7 no connection 8 no connection 5 0 CONFIGURATION All configuration is done through software auto detection for the Model 2135 Once you have configured your mux or other equipment to be connected to the 2135 the unit is ready for operation Observe that the serial port of the 2135 is configured as a DTE and must con nect to a DCE The LAN port also requires no configuration to connect to a 10BaseT Ethernet Note The V 35 Interface is configured as a DTE The 2135 will transmit and receive data to and from the DCE based on the speed of the clocks received from the DCE On the LAN side interface data is sent and received in burst mode at 10Mbps 5 1 LED STATUS MONITORS The 2135 uses two LEDs on the Ethernet connection side A green LED indicates that link connection to the network is established The yellow LED displays status codes See section 5 1 2 for status code information Seven low power LEDs loca2. 15 of FCC rules that are designed to pro vide reasonable protection from such interference in a commercial installation However this is no guarantee that interference will not occur in a particular installation If the Model 2135 does cause interfer ence to radio or television reception which can be determined by dis connecting the unit the user is encouraged to try to correct the inter ference by one or more of the following measures moving the com puting equipment away from the receiver re orienting the receiving antenna and or plugging the receiving equipment into a different AC outlet such that the computing equipment and receiver are on different branches In the event the user detects intermittent or continuous product malfunction due to nearby high power transmitting radio fre quency equipment the user is strongly advised to use only a shielded twisted pair data cable that is bonded to metalized external outer shield plugs at both ends The use of a shielded cable satisfies compliance with the Electromagnetic Compatibility EMC directive 1 2 CE NOTICE The CE symbol on your Patton Electronics equipment indicates that it is in compliance with the Electromagnetic Compatibility EMC directive and the Low Voltage Directive LVD of the Union European EU A Certificate of Compliance is available by contacting Patton Technical Support NOTE Packages received without an RMA number will not be accepted 3 0 PPP OPERATI
3. ONAL BACKGROUND PPP is a protocol used for multi plexed transport over a point to point link PPP operates on all full duplex media and is a symmetric peer to peer protocol which can be broken into three main components 1 A standard method to encapsulate datagrams over serial links 2 A Link Control Protocol LCP to establish configure and test the data link connection 3 A family of Network Control Protocols NCPs to establish and configure different net work layer protocols In order to establish communications over a point to point link each end of the PPP link must first announce its capabilities and agree on the para meters of the link s operation This exchange is facilitated through LCP Configure Request packets Once the link has been established and optional facilities have been negotiated PPP will attempt to establish a network protocol PPP will use Network Control Protocol NCP to choose and configure one or more net work layer protocols Once each of the network layer protocols have been configured datagrams from the established network layer protocol can be sent over the link The link will remain configured for these communications until explicit LCP or NCP packets close the link down or until some external event occurs The PPP Bridging Control Protocol BCP defined in RFC 1638 configures and enables disables the bridge protocol on both ends of the point to point link BCP uses the same packet exchange mecha ni
4. USER MANUAL ISO CAR TIFIED An ISO 9001 Certified Company 1 0 WARRANTY INFORMATION Patton Electronics warrants all Model 2135 components to be free from defects and will at our option repair or replace the product should it fail within one year from the first date of shipment This warranty is limited to defects in workmanship or materials and does not cover customer damage abuse or unauthorized modifi cation If this product fails or does not perform as warranted your sole recourse shall be repair or replacement as described above Under no condition shall Patton Electronics be liable for any damages incurred by the use of this product These damages include but are not limited to the following lost profits lost savings and incidental or consequen tial damages arising from the use of or inability to use this product Patton Electronics specifically disclaims all other warranties expressed or implied and the installation or use of this product shall be deemed an acceptance of these terms by the user 1 1 RADIO AND TV INTERFERENCE The Model 2135 generates and uses radio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio and tele vision reception The Model 2135 has been tested and complies with the limits for a Class A computing device in accordance with the speci fication in Subpart J of Part
5. ge ated Cisco configuration will set serial interface s0 to accommodate half bridging for the above example Authentication is optional under PPP In a point to point leased line link incoming customer facilities are usually fixed in nature there fore authentication is generally not required If the foreign device requires authentication via PAP or CHAP the PPP software will respond with default Peer ID consisting of the units Ethernet MAC address and a password which consists of the unit s Ethernet MAC address Some networking systems do not define network numbers in pack ets sent out over a network If a packet does not have a specific desti nation network number a router will assume that the packet is set up for the local segment and will not forward it to any other sub network However in cases where two devices need to communicate over the wide area bridging can be used to transport non routable protocols Figure 2 illustrates transparent bridging between two routers over a serial interface s0 Bridging will occur between the two Ethernet Interfaces on Router A e0 and e1 and the two Ethernet Interfaces on Router B e0 and el no ip routing interface EthernetO ip address 1 1 1 1 255 255 255 0 bridge group 1 interface SerialO ip address 1 1 1 1 255 255 255 0 encapsulation PPP Router B bridge group 1 interface Serial ip address 2 2 2 2 255 255 255 0 bridge group 1 LAN bridge 1 protocol ieee
6. sm as the Link Control Protocol LCP BCP is a Network Control Protocol of PPP bridge packets may not be exchanged until PPP has reached the network layer protocol phase 3 1 Applications In situations where a routed network requires connectivity to a remote Ethernet network the interface on a router can be configured as a PPP IP Half Bridge The serial line to the remote bridge functions as a Virtual Ethernet interface effectively extending the routers serial port connection to the remote network The bridge device sends bridge packets BPDU s to the router s serial interface The router will receive the layer three address information and will forward these packets based on its IP address Figure 1 shows a typical Cisco router with a serial interface configured as a PPP Half Bridge The router serial interface uses a remote device that supports PPP bridging to function as a node on the remote Ethernet net work The serial interface on the Cisco will have an IP address on the same Ethernet subnet as the bridge For example the customer site is assigned the addresses 192 168 1 0 24 through 192 168 1 1 24 The address 192 168 1 1 24 is also the default gateway for the remote network The above settings remove any routing forwarding intelligence from the CPE The associ 5 Router Internet Ne Ethernet LAN Customer Site Service Provider s Network Figure 1 Cisco router with serial interface configured as PPP Half Brid
7. ted on the top of the 2135 case indi cate POWER and V 35 signal activity 5 1 1 LAN side LEDs The Model 2135 features two LAN LEDs that monitor general operation status and the 10BaseT twisted pair link integrity Figure 4 shows the LEDs located at the rear of the Model 2135 Following Figure 4 is a description of each LED function Figure 5 shows the LEDs located on the top of the Model 2135 Figure 4 2135 rear view 5 1 2 LED Descriptions The status LED blinks yellow from one to eleven times to indicate system status Each pulse pattern is separated by a 2 second off peri od Greater pulse patterns have higher priority buffer saturation has greater priority than an empty MAC table Valid system statuses are 1 pulse system status ok 2 pulses No MAC entries in the MAC address table 3 pulses Clear to send CTS or Carrier Detect DCD from base unit are not asserted 4 pulses IMRC2 IA buffer is saturated 5 pulses WAN receive frame s too large 6 pulses WAN receive frame s not Octet aligned 7 pulses WAN receive frame s aborted 8 pulses Detected WAN receive frame s with bad CRC 9 pulses Detected LAN receive frame s too large 10 pulses Detected LAN receive frame s not Octet aligned 11 pulses Detected LAN receive frame s with bad CRC After a status code is displayed eight times and the associated con dition is removed the status code will no longer appear The link LED glows green
8. to indicate link integrity on the 10BaseT twisted pair line 5 1 3 Power and DCE DTE Interface LEDs Seven LEDs indicate POWER and DTE DCE activity on the front of the 2135 10 PE PATION E 36 5 2 5 2 2 5 a m 2 o E 3 9 no Toy 0 a Oo 5 2 Z pal pe o e ic o 2 5 ir 13
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