Patton electronics 2121, 2135C User Manual

USER
MANUAL

Model 2121/2135C
Ethernet Micro-Bridge

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]

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

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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 [phone].

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: [phone]

Email: http://www.patton.com

www: [e-mail].

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