USER
MANUAL
Model 2121/2135C
Ethernet Micro-Bridge
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part# 07M2121-A
Doc# 083051UA
Revised 09/06/00
An ISO-9001
Certified
Company
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 modification. 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 consequential 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 2121/2135Cgenerates 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 television reception. The Model 2121/2135Chas 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 interference 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.
TABLE OF CONTENTS
Section Page
1.0Warranty Information.............................................................2
1.1Radio and TV Interference
1.2 CE Notice
1.3Service
2.0General Information...............................................................4
2.1Features
2.2Description
3.0 PPP Operational Background................................................5
3.1 Applications
4.0Installation............................................................................7
4.1Connect 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
4.3Power Connection
4.3.1 AC Power Supply (100-240VAC)
4.3.2 DC Power
5.0 Configuration........................................................................11
5.1LED 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
2
3
2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions or problems arise
during installation or use of this product, please do not hesitate to contact 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 signals
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, multicast, 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.
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.
4
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 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 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 e1).
2121/2135C
Bridge
Ethernet LAN
PEC Device w/
Serial I/F
Router
5
Figure 1.
Cisco router with serial interface, configured as PPP Half Bridge.
Using Bridge-Groups, multiple remote LANs can be
bridged over the wide-area.
3.0 PPP OPERATIONAL BACKGROUND
PPP is a protocol used for multi-plexed transport over a pointto-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 network 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 configure one or more network 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 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, 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 network. The serial interface on the
Cisco will have an IP address on the same Ethernet subnet as
the bridge.
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
7
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 100240VAC, 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 available 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.
4.0 INSTALLATION
The 2121/2135C is equipped with Network, DTE, and power
interfaces. This section briefly describes connnection to each interface.
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 construct 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
8
Figure 4.Strap positions 7 and 8 on J3
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.
9
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
powering option, set J3 to position 7 and 8 as shown in figure
4 (factory default).
The 36-60 VDC DC to DC adapter supplied with the DC
version of the Model 2121/2135C plugs in a DC source (nominal 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.
10
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 support 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.
+ Vin
To Power
Supply Jack
- Vin
To -48VDC
Source
Figure 6.Strap positions 1 and 2 on J3
Figure 7.Strap positions 3 and 4 on J3
11
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.
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 activity.
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.
12
Green LED, link integrity
Yellow LED, Status
Figure 8.
2121/2135C rear view
RJ-45 Jack, 10BaseT connection
POWER
JACK
13 14
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.
Figure 9. Front of Model 2121, showing LED Indicators
TXD
RXD
CTRL
IND
STAT
CLK
PWR
Figure 10. Front of Model 2135C, showing LED Indicators
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.
15
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
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 orientation).
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
17 18
APPENDIX C
2121/2135C FACTORY
REPLACEMENT PARTS
Part # Description
07M2121/2135C........2121/2135C User Manual
0805DCUI..................100-250 VAC Universal Power Supply
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
19 20
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)
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)
21
APPENDIX G
POWER SUPPLY INTERFACE
Via 5VDC power jack (J1)
Center Pin: +5VDC @ 500 mA minimun
Outer Barrel: Ground
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