Patton electronic Network Router 2121 User Manual

USER  
MANUAL  
Model 2121/2135C  
Ethernet Micro-Bridge  
Part# 07M2121-A  
Doc# 083051UA  
Revised 09/06/00  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
An ISO-9001  
Certified  
Company  
 
2.0 GENERAL INFORMATION  
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:  
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  
Tel:  
(301) 975-1007  
www: support@patton.com.  
- 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  
NOTE: Packages received without an RMA number will  
not be accepted.  
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.  
- 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  
WARNING!  
This device is not intended to be con-  
nected to the public telephone network.  
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
3
 
Router  
2121/2135C  
Bridge  
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.  
Ethernet LAN  
PEC Device w/  
Serial I/F  
Figure 1. Cisco router with serial interface, configured as PPP Half 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).  
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.  
!
Patton Modems with  
Ethernet Interface  
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  
!
Router A  
S0  
LAN  
Using Bridge-Groups, multi-  
ple remote LANs can be  
e0  
S1  
LAN  
bridged over the wide-area.  
Router B  
S1  
S0  
LAN  
e0  
e1  
LAN  
LAN  
Patton Modems with  
Ethernet Interface  
bridge 1 protocol ieee  
!
Figure 2. Transparent bridging between two routers over a serial link.  
5
6
 
4.0 INSTALLATION  
4.3 POWER CONNECTION  
The 2121/2135C is equipped with Network, DTE, and power  
interfaces. This section briefly describes connnection to each inter-  
face.  
The Model 2121/2135C offers either an AC or DC power sup-  
ply.  
The 2121/2135C provides a strap selectable power supply.  
4.1 CONNECT TO 10BASET ETHERNET PORT  
4.3.1 AC Power Supply (100-240VAC)  
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.  
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.  
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)  
Note: Default setting has strap on position 7 and 8 on J3 for  
AC power supply. See figure 4 below.  
Figure 3. Model 2121/2135C Ethernet connector pinout  
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)  
Figure 4. Strap positions 7 and 8 on J3  
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+)  
2 (TX-)  
3 (RX+)  
6 (RX-)  
1 (TX+)  
2 (TX-)  
3 (RX+)  
6 (RX-)  
7
8
 
Power-up 2121 via DB-15 Connector on Pin 15  
4.3.2 DC Power  
Place strap position 1 and 2 on J3 for DC power supply. See  
figure 6 below.  
Supply DC power directly to the power supply jack. DC  
power supplied must be +5VDC ±5%, 500mA minimum, cen-  
ter 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  
powering option, set J3 to position 7 and 8 as shown in figure  
4 (factory default).  
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.  
The 36-60 VDC DC to DC adapter supplied with the DC  
version of the Model 2121/2135C plugs in a DC source (nom-  
inal 48VDC) and plugs into the barrel power supply jack on  
the rear of 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 -48VDC  
Source  
+ Vin  
To Power  
Supply Jack  
Figure 6. Strap positions 1 and 2 on J3  
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.  
- Vin  
Figure 5: Connecting DC Power to the 2121/2135C DC Power Supply.  
Power-up 2135C via M/34 Connector on Pin NN  
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  
Place strap position 3 and 4 on J3 for DC power supply. See figure 7  
below.  
Figure 7. Strap positions 3 and 4 on J3  
9
10  
 
5.1.2 LED Descriptions  
5.0 CONFIGURATION  
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).  
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  
Valid system statuses are:  
2121/2135C is configured as a DTE and must connect to a DCE.  
1 pulse = system status ok  
The LAN port also requires no configuration to connect to a  
10BaseT Ethernet.  
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  
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.  
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  
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).  
After a status code is displayed eight times and the associ-  
ated condition is removed, the status code will no longer appear.  
Seven, low power, LEDs located on the top of the  
2121/2135C case indicate POWER and X.21 or V.35 signal activ-  
ity.  
The link LED glows green to indicate link integrity on the  
10BaseT twisted pair line.  
5.1.3 Power and DCE/DTE Interface LEDs  
5.1.1 LAN side LEDs  
Seven LEDs indicate POWER and DTE/DCE activity on the  
front of the 2121/2135C.  
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.  
RJ-45 Jack, 10BaseT connection  
POWER  
JACK  
Yellow LED, Status  
Green LED, link integrity  
Figure 8. 2121/2135C rear view  
12  
11  
 
TXD  
RXD  
CTRL  
IND  
STAT  
CLK  
PWR  
Figure 10. Front of Model 2135C, showing LED Indicators  
Figure 9. Front of Model 2121, showing LED Indicators  
TXD- Trasmit data LED (green) blinks to indicate data transi-  
tions and remains OFF when no data is transmitted (idle).  
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).  
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.  
CTRL- Control LED (yellow)- turns ON at power up to indi-  
cate to the DCE that the 2121 is active.  
CTS- Clear to Send LED (yellow) - turns ON when the 2135C  
is ready to receive data from the DCE.  
IND- Indication LED (yellow) - turns ON when the 2121 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.  
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.  
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.  
PWR- LED (green) turns ON as soon as power is applied to  
the 2121/2135C.  
13  
14  
 
APPENDIX A  
APPENDIX B  
PATTON ELECTRONICS MODEL 2121  
SPECIFICATIONS  
PATTON ELECTRONICS MODEL 2135C  
SPECIFICATIONS  
LAN Connection:  
RJ-45, 10BaseT, 802.3 Ethernet sup-  
ported by Transparent LAN  
LAN Connection:  
RJ-45, 10BaseT, 802.3 Ethernet sup-  
ported by Transparent LAN bridging  
bridging  
DTE connection:  
tion).  
DB-15 connector, X.21 (DTE orienta-  
DTE connection:  
Protocol:  
M34 connector, V.35 (DTE orienta-  
tion).  
Protocol:  
PPP (RFC 1661) with Bridging Control  
Protocol (RFC 1638)  
PPP (RFC 1661) with Bridging Control  
Protocol (RFC 1638)  
MAC Address  
Table Size:  
MAC Address  
Table Size:  
4096 entries  
4096 entries  
MAC Address Aging: MAC addresses deleted after eight  
MAC Address Aging: MAC addresses deleted after eight  
minutes inactivity  
min-  
utes inactivity  
1 MB RAM; 128 KB FLASH  
1 frame  
On-board Memory:  
Frame Latency:  
LEDs LAN Side:  
On-board Memory:  
Frame Latency:  
LEDs LAN Side:  
1 MB RAM; 128 KB FLASH  
1 frame  
(1) yellow, general status; (1) green,  
link integrity  
(1) yellow, general status; (1) green,  
link integrity  
LEDs DTE Side:  
CTRL,  
TXD, RXD and Power, (green);  
IND and CLK, (Yellow)  
LEDs DTE Side:  
TD, RD and Power, (green); DTR,  
CTS and CLK, (Yellow)  
Power supply Input:  
100-240VAC, 50-60Hz, 0.4A  
Power supply Input:  
100-240VAC, 50-60Hz, 0.4A  
Power Consumption: 500mA @ 5VDC.  
Power Consumption: 500mA @ 5VDC.  
Humidity:  
Up to 90% non-condensing  
Humidity:  
Up to 90% non-condensing  
Temperature:  
Dimensions:  
0 -50 C  
Temperature:  
Dimensions:  
0 -50 C  
9.0 x 5.3 x 2.0 cm (3.5"L x 2.1"W x  
0.78"H)  
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  
Compliance:  
FCC Part 15A  
CE Mark per EEC Directive  
89/336/EEC  
Low Voltage Directive  
73/23/EEC  
Low Voltage Directive  
73/23/EEC  
15  
16  
 
APPENDIX C  
APPENDIX D  
2121/2135C FACTORY  
REPLACEMENT PARTS  
10BaseT Interface Pin Assignment  
(RJ-45 Female Connector)  
(DTE Configuration)  
Part #  
Description  
Pin #  
Signal  
07M2121/2135C........2121/2135C User Manual  
0805DCUI..................100-250 VAC Universal Power Supply  
1 TD +  
2 TD -  
3 RD +  
4
(data output from 2121/2135C)  
(data output from 2121/2135C)  
(data input to 2121/2135C)  
no connection  
5
6 RD -  
7
8
no connection  
(data input to 2121/2135C)  
no connection  
no connection  
17  
18  
 
APPENDIX F  
APPENDIX E  
V.35 Terminal Interface Pin Assignment  
(M/34 Male Connector)  
X.21 Terminal Interface Pin Assignment  
(DB-15 Male Connector)  
Pin #  
Signal  
Pin #  
Signal  
A GND  
B SGND  
D CTS  
E DSR  
F CD  
H (DTR)  
P TD  
R RD  
S TD/  
T RD/  
V RC  
X RC/  
Y TC  
(Earth Ground/Shield)  
(Signal Ground)  
(DCE Source)  
(DCE Source, Always On)  
(DCE Source)  
(DTE Source)  
(Transmit Data +, DTE Source)  
(Receive Data +, DCE Source)  
(Transmit Data -, DTE Source)  
(Receive Data -, DCE Source)  
(Receiver Clock +, DCE Source)  
(Receiver Clock -, DCE Source)  
(Transmitter Clock +, DCE Source)  
(Transmitter Clock -, DCE Source)  
(+5VDC)  
1
2
3
4
5
6
8
9
10  
11  
12  
13  
14  
15  
Frame GND  
Transmilt A  
Control A  
Receive A  
Indication A  
Signal Timing A  
Signal GND  
Transmit B  
Control B  
Receive B  
Indication B  
Signal Timing B  
DC Power (+5VDC)  
DC Power (+5VDC)  
AA TC/  
KK (Power)  
NN (Power)  
(+5VDC)  
19  
20  
 
APPENDIX G  
POWER SUPPLY INTERFACE  
Via 5VDC power jack (J1)  
Center Pin: +5VDC @ 500 mA minimun  
Outer Barrel: Ground  
21  
 

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