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USER MANUAL
Model 2121/2135C Ethernet Micro-Bridge
SALES OFFICE (301) 975-1000 TECHNICAL SUPPORT (301) 975-1007
http://www.patton.com
Part# 07M2121-UM Doc# 08305U2-001, Rev. B Revised 10/25/06
CERTIFIED
An ISO-9001 Certified Company 23
Notes
__________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________
Copyright © 2006 Patton Electronics Company All Rights Reserved

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TABLE OF CONTENTS Section Page 1.0 Warranty Information.............................................................2 1.1 Radio and TV Interference 1.2 CE Notice 1.3 Service 2.0 General Information...............................................................4 2.1 Features 2.2 Description 3.0 PPP Operational Background................................................5 3.1 Applications 4.0 Installation ............................................................................7 4.1 Connect to 10BaseT Ethernet Port 4.1.1 Connect the 10BaseT Ethernet Port to a Hub 4.1.2 Connect the 10BaseT Ethernet Port to a PC (DTE) 4.2 Connect to the DTE Interface 4.3 Power Connection 4.3.1 AC Power Supply (100-240VAC) 4.3.2 DC Power 5.0 Configuration........................................................................11 5.1 LED Status Monitors 5.1.1 LAN side LEDs 5.1.2 LED Descriptions 5.1.3 Power and DCE/DTE Interface LEDs Appendix A - 2121 Specifications ...............................................15 Appendix B - 2135C Specifications............................................16 Appendix C - Factory Replacement Parts..................................17 Appendix D - 10BaseT Interface Pin Assignment ......................18 Appendix E - X.21 Terminal Interface Pin Assignment...............15 Appendix E - V.35 Terminal Interface Pin Assignment ...............20 Appendix G - Power Supply Interface ........................................21 1 1.0 WARRANTY INFORMATION Patton Electronics warrants all Model 2121/2135C 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 2121/2135C generates and uses radio frequency ener- gy, and if not installed and used properly—that is, in strict accordance with the manufacturer??s instructions—may cause interference to radio and television reception. The Model 2121/2135C has been tested and complies with the limits for a Class A computing device in accordance with the specification in Subpart J of Part 15 of FCC rules, that are designed to provide reasonable protection from such interference in a commercial installation. However, this is no guarantee that interfer- ence will not occur in a particular installation. If the Model 2121/2135C does cause interference to radio or television reception, which can be determined by disconnecting the unit, the user is encouraged to try to correct the interference by one or more of the following measures: moving the computing 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 frequency 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. 2

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3 1.3 SERVICE All warranty and non-warranty repairs must be returned freight prepaid and insured to Patton Electronics. All returns must have a Return Materials Authorization (RMA) number on the outside of the shipping container. This number may be obtained from Patton Electronics Technical Support at: Tel: (301) 975-1007 Email: http://www.patton.com www: support@patton.com. Patton Electronics?? technical staff is also available to answer any questions that might arise concerning the installation or use of your Model 2121/2135C. Technical Support hours: 8AM to 5PM EST, Monday through Friday.
WARNING!
This device is not intended to be con- nected to the public telephone network.
NOTE: Packages received without an RMA number will
not be accepted. 2.0 GENERAL INFORMATION Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warrant- ed for One Year parts and labor. If any questions or problems arise during installation or use of this product, please do not hesitate to con- tact Patton Electronics Technical Support at (301) 975-1007. 2.1 FEATURES - Integral V.35 Male to 10BaseT Ethernet (Model 2135C) - Integral X.21 Male to 10BaseT Ethernet (Model 2121) - Industry standard, shielded RJ-45 10BaseT connection - 802.3 Ethernet supported by Transparent LAN bridging - PPP Bridging Control Protocol (RFC 1638) with auto detection for compatibility with existing Patton Bridge Modules - 4096 MAC address table - 1 MB RAM; 128KB FLASH expandable to 512 KB - Throughput latency of 1 frame - Automatic LAN MAC address aging - Nine LEDs monitor power, LAN, and DTE Interface sig- nals 2.2 DESCRIPTION The Patton Model 2121/2135C MicroBridge is an Ethernet Bridge that provides LAN extension when used in conjunction with a X.21 or V.35 DCE device, such as a DSU/CSU, NTU, or router. The Model 2121/2135C performs transparent Ethernet bridging and functions at the MAC level, thus is transparent to higher level protocols such as TCP/IP, DECnet, NETBIOS, and IPX network protocols. Only broadcast, multi- cast, or frames set up for peered LAN are forwarded. The Model 2121/2135C is 802.3 Ethernet compliant and supports PPP Bridging Control Protocol (RFC 1638) on the DTE side. 4

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5 3.0 PPP OPERATIONAL 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 sym- metric 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, con- figure, 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 parameters 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 con- figure one or more network layer protocols. Once each of the net- work 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 mechanism 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, effec- tively 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 network. 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 net- work. The above settings remove any routing/forwarding intel- ligence from the CPE. The associated 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, therefore 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 packets sent out over a network. If a packet does not have a specific destination network number, a router will assume that the packet is set up for the local segment and will not for- ward it to any other sub-network. However, in cases where two devices need to communicate over the wide-area, bridg- ing 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 e1).
Patton 2121/2135C Bridge Ethernet LAN PEC Device w/ Serial I/F Router Figure 1. Cisco router with serial interface, configured as PPP Half Bridge. Using Bridge-Groups, multi- ple remote LANs can be bridged over the wide-area.
6
! no ip routing ! interface Ethernet0 ip address 1.1.1.1 255.255.255.0 bridge-group 1 ! interface Serial0 ip address 1.1.1.1 255.255.255.0 encapsulation PPP bridge-group 1 ! interface Serial1 ip address 2.2.2.2 255.255.255.0 bridge-group 1 ! bridge 1 protocol ieee ! Figure 2. Transparent bridging between two routers over a serial link.
Router A Patton Modems with Ethernet Interface Router B Patton Modems with Ethernet Interface
e0 e0 S1 e1 S1 S0 S0 LAN LAN LAN LAN LAN

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7 4.0 INSTALLATION The 2121/2135C is equipped with Network, DTE, and power interfaces. This section briefly describes connnection to each inter- face. 4.1 CONNECT TO 10BASET ETHERNET PORT The shielded RJ-45 Ethernet port on the Model 2121/2135C is designed to connect directly to a 10BaseT network. Figure 3 shows the 10BaseT RJ-45 port pin description. You may make connections up to 300 feet using type 4 or 5 cable. 4.1.1 Connect the 10BaseT Ethernet Port to a Hub The Model 2121/2135C 10BaseT interface is configured as DTE (Data Terminal Equipment). Use the diagram below to con- struct a cable to connect the 2121/2135C to a 10BaseT Hub. 2121/2135C 10BaseT Hub RJ-45 Pin No. RJ-45 Pin No. 1 (TX+)..........................1 (RX+) 2 (TX-)..........................2 (RX-) 3 (RX+).........................3 (TX+) 6 (RX-)..........................6 (TX-) 4.1.2 Connect the 10BaseT Ethernet Port to a PC (DTE) The Model 2121/2135C 10BaseT interface is configured as DTE (Data Terminal Equipment). To connect the 2121/2135C to another DTE such as a 10BaseT network interface card in a PC, construct a 10BaseT crossover cable as shown in the diagram below. 2121/2135C 10BaseT DTE RJ-45 Pin No. RJ-45 Pin No. 1 (TX+) 1 (TX+) 2 (TX-) 2 (TX-) 3 (RX+) 3 (RX+) 6 (RX-) 6 (RX-)
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)
Figure 3. Model 2121/2135C Ethernet connector pinout
4.3 POWER CONNECTION The Model 2121/2135C offers either an AC or DC power sup- ply. The 2121/2135C provides a strap selectable power supply. 4.3.1 AC Power Supply (100-240VAC) The Model 2121/2135C uses a 5VDC, 2A universal input 100- 240VAC, power supply (center pin is +5V). The universal input power supply is equipped with a male IEC-320 connector. This power supply connects to the Model 2121/2135C via a barrel jack on the rear panel. A variety of international power cords are avail- able for the universal power supply. The Model 2121/2135C powers up as soon as it is plugged into an AC outlet. The unit does not have a power switch. The 2121/2135C is factory set to be used with the AC power supply. Note: Default setting has strap on position 7 and 8 on J3 for AC power supply. See figure 4 below. 8
Figure 4. Strap positions 7 and 8 on J3

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4.3.2 DC Power
Supply DC power directly to the power supply jack. DC power supplied must be +5VDC ??5%, 500mA minimum, center positive, and can be supplied via a barrel type plug with 2.1/5.5/10mm I.D./O.D./Shaft Length dimensions. For this pow- ering option, set J3 to position 7 and 8 as shown in figure 4 (fac- tory default). The 36-60 VDC DC to DC adapter is supplied with the DC ver- sion of the Model 2121/2135C. The black and red leads plug into a DC source (nominal 48VDC) and the barrel power con- nector plugs into the barrel power supply jack on the 2121/2135C. See Figure 5 below. For this powering option, set J3 to position 7 and 8 as shown in figure 4 (factory default). DC power (+5VDC) can also be supplied via pins 14 or 15 on the DB-15 connector for the Model 2121. DC power (+5VDC) can also be supplied via pins KK or NN on the M/34 connector for the Model 2135C.
To Power Supply Jack To -48VDC Source
-Vin +Vin
SWITCHING POWER SUPPLY MODEL : SYD1106-0505 INPUT : 36-60V 0.2A MAX OUTPUT : +5V 1.0A OUTPUT POWER : 5W MAX S/N : G01234567890MADE IN CHINA BY SUNNY Black lead (-V) Red lead (+V) Barrel power connector
WARNING! There are no user-serviceable parts in the
power supply section of the Model 2121/2135C. For more information, please contact Patton Electronics Technical sup- port at (301)975-1007, via our web site at http://www.patton.com, or by e-mail at support@patton.com.
Figure 5: Connecting DC Power to the 2121/2135C DC Power Supply.
Power-up 2121 via DB-15 Connector on Pin 15 Place strap position 1 and 2 on J3 for DC power supply. See figure 6 below. Power-up 2135C via M/34 Connector on Pin KK Place strap position 1 and 2 on J3 for DC power supply. See figure 6 below. Power-up 2121 via DB-15 Connector on Pin 14 Place strap position 3 and 4 on J3 for DC power supply. See figure 7 below. Power-up 2135C via M/34 Connector on Pin NN Place strap position 3 and 4 on J3 for DC power supply. See figure 7 below. 10
Figure 6. Strap positions 1 and 2 on J3 Figure 7. Strap positions 3 and 4 on J3

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5.0 CONFIGURATION All configuration is done through software auto-detection for the Model 2121/2135C. Once you have configured your mux or other equipment to be connected to the 2121/2135C, the unit is ready for operation. Observe that the serial port of the 2121/2135C is configured as a DTE and must connect to a DCE. The LAN port also requires no configuration to connect to a 10BaseT Ethernet. Note: The X.21 and V.35 Interface is configured as a DTE. The 2121/2135C 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 2121/2135C 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 located on the top of the 2121/2135C case indicate POWER and X.21 or V.35 signal activ- ity. 5.1.1 LAN side LEDs The Model 2121/2135C features two LAN LEDs that monitor general operation status and the 10BaseT twisted pair link integrity. Figure 8 shows the LEDs located at the rear of the Model 2121/2135C. Following Figure 8 is a description of each LED function. Figure 8 shows the LEDs located on the top of the Model 2121/2135C.
Green LED, link integrity Yellow LED, Status
11
Figure 8. 2121/2135C rear view RJ-45 Jack, 10BaseT connection POWER JACK
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 " period. 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 associ- ated condition is removed, the status code will no longer appear. The link LED glows green 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 2121/2135C. 12

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TXD- Trasmit data LED (green) blinks to indicate data transi- tions and remains OFF when no data is transmitted (idle). RXD- Received data LED (green) blinks to indicate data tran- sitions and remains OFF when no data is received (idle). CTRL- Control LED (yellow)- turns ON at power up to indi- cate to the DCE that the 2121 is active. IND- Indication LED (yellow) - turns ON when the 2121 is ready to receive data from the DCE. STAT- Status LED (yellow) - Turns ON to indicate that a carri- er detect signal is received from the DCE. CLK- Clock Signal LED (yellow) - blinks to indicate that the transmit clock from the DCE is active. The CLK LED will remain OFF to indicate the absence of the transmit clock. PWR- LED (green) turns ON as soon as power is applied to the 2121/2135C.
Model 2121 Ethernet MicroBridge
TXD RXD DTR CTS DCD CLK PWR
Gaithersb urg, Maryland
Figure 9. Front of Model 2121, showing LED Indicators
TXD RXD CTRL IND STAT CLK PWR
13 14
Model 2121 Ethernet MicroBridge
TXD RXD DTR CTS DCD CLK PWR
Gaithersb urg, Maryland
Figure 10. Front of Model 2135C, showing LED Indicators
2135C
TXD- Trasmit data LED (green) blinks to indicate data transi- tions and remains OFF when no data is transmitted (idle). RXD- Received data LED (green) blinks to indicate data tran- sitions and remains OFF when no data is received (idle). DTR- Data Terminal Ready LED (yellow)- turns ON at power up to indicate to the DCE that the 2135C is active. CTS- Clear to Send LED (yellow) - turns ON when the 2135C is ready to receive data from the DCE. DCD- Data Carrier Detect LED (yellow) - Turns ON to indi- cate that a carrier detect signal is received from the DCE. CLK- Clock Signal LED (yellow) - blinks to indicate that the transmit clock from the DCE is active. The CLK LED will remain OFF to indicate the absence of the transmit clock. PWR- LED (green) turns ON as soon as power is applied to the 2135C.

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15 APPENDIX A PATTON ELECTRONICS MODEL 2121 SPECIFICATIONS LAN Connection: RJ-45, 10BaseT, 802.3 Ethernet sup- ported by Transparent LAN bridging DTE connection: DB-15 connector, X.21 (DTE orienta- tion). Protocol: PPP (RFC 1661) with Bridging Control Protocol (RFC 1638) MAC Address Table Size: 4096 entries MAC Address Aging: MAC addresses deleted after eight min- utes inactivity On-board Memory: 1 MB RAM; 128 KB FLASH Frame Latency: 1 frame LEDs LAN Side: (1) yellow, general status; (1) green, link integrity LEDs DTE Side: TXD, RXD and Power, (green); CTRL, IND and CLK, (Yellow) Power supply Input: 100-240VAC, 50-60Hz, 0.4A Power Consumption: 500mA @ 5VDC. Humidity: Up to 90% non-condensing Temperature: 0 -50 C Dimensions: 9.0 x 5.3 x 2.0 cm (3.5"L x 2.1"W x 0.78"H) Compliance: FCC Part 15A CE Mark per EEC Directive 89/336/EEC Low Voltage Directive 73/23/EEC APPENDIX B PATTON ELECTRONICS MODEL 2135C SPECIFICATIONS LAN Connection: RJ-45, 10BaseT, 802.3 Ethernet sup- ported by Transparent LAN bridging DTE connection: M34 connector, V.35 (DTE orienta- tion). Protocol: PPP (RFC 1661) with Bridging Control Protocol (RFC 1638) MAC Address Table Size: 4096 entries MAC Address Aging: MAC addresses deleted after eight minutes inactivity On-board Memory: 1 MB RAM; 128 KB FLASH Frame Latency: 1 frame LEDs LAN Side: (1) yellow, general status; (1) green, link integrity LEDs DTE Side: TD, RD and Power, (green); DTR, CTS and CLK, (Yellow) Power supply Input: 100-240VAC, 50-60Hz, 0.4A Power Consumption: 500mA @ 5VDC. Humidity: Up to 90% non-condensing Temperature: 0 -50 C Dimensions: 9.0 x 5.3 x 2.0 cm (3.5"L x 2.1"W x 0.78"H) Compliance: FCC Part 15A CE Mark per EEC Directive 89/336/EEC Low Voltage Directive 73/23/EEC 16

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18 APPENDIX D 10BaseT Interface Pin Assignment (RJ-45 Female Connector) (DTE Configuration) Pin # Signal 1 TD + (data output from 2121/2135C) 2 TD - (data output from 2121/2135C) 3 RD + (data input to 2121/2135C) 4 no connection 5 no connection 6 RD - (data input to 2121/2135C) 7 no connection 8 no connection 17 APPENDIX C 2121/2135C FACTORY REPLACEMENT PARTS Part # Description 07M2121/2135C........2121/2135C User Manual 0805DCUI..................100-250 VAC Universal Power Supply

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APPENDIX E X.21 Terminal Interface Pin Assignment (DB-15 Male Connector) Pin # Signal 1 Frame GND 2 Transmilt A 3 Control A 4 Receive A 5 Indication A 6 Signal Timing A 8 Signal GND 9 Transmit B 10 Control B 11 Receive B 12 Indication B 13 Signal Timing B 14 DC Power (+5VDC) 15 DC Power (+5VDC)
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APPENDIX F V.35 Terminal Interface Pin Assignment (M/34 Male Connector) Pin # Signal A GND (Earth Ground/Shield) B SGND (Signal Ground) D CTS (DCE Source) E DSR (DCE Source, Always On) F CD (DCE Source) H (DTR) (DTE Source) P TD (Transmit Data +, DTE Source) R RD (Receive Data +, DCE Source) S TD/ (Transmit Data -, DTE Source) T RD/ (Receive Data -, DCE Source) V RC (Receiver Clock +, DCE Source) X RC/ (Receiver Clock -, DCE Source) Y TC (Transmitter Clock +, DCE Source) AA TC/ (Transmitter Clock -, DCE Source) KK (Power) (+5VDC) NN (Power) (+5VDC)

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APPENDIX G POWER SUPPLY INTERFACE Via 5VDC power jack (J1) Center Pin: +5VDC @ 500 mA minimun Outer Barrel: Ground 22
Notes
__________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________ __________________________________________

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