Patton electronics IM 1/I User Manual

USER
MANUAL

MODEL IM 1/I

Ethernet Bridge Module

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]

http://www.patton.com

Part# 07MIM1/I-E

Doc# 090101U

,

Rev. F

Revised 1/22/08

CERTIFIED

An ISO-9001

Certified Company

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1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model IM1/I 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 IM1/I 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
television reception. The Model IM1/I 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 interference will not
occur in a particular installation. If the Model IM1/I 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, reorienting 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.

2.0 GENERAL I N F O R M A T I O N

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 us at: [phone], http://www.patton.com;

[e-mail].

2.1 FEATURES

• Installs in Patton’s baseband modem, CSU/DSU, 64k/G.703
converter and fiber modem base units

• Provides MAC level connection between two peered Ethernet

LANs

• PPP (Point to Point Protocol) RFC 1661 (with Bridging Control
Protocol) RFC 1638

• Operates transparently to higher level protocols such as TCP/IP,
DECnet, NETBIOS and IPX

• No configuration necessary

• Automatically discovers, loads and deletes MAC addresses

• 512 KB on-board RAM

• Modular 10Base-T connection (RJ-45)

• Two LED indicators: status & link integrity

2.2 DESCRIPTION

The Patton IM1/I

QuikConnect™

Ethernet WAN bridge module
installs in Patton’s copper and fiber base units to provide seamless
Ethernet LAN extension. The Patton IM1/I performs the bridging
function between two physically separate Ethernet LANs at the MAC
level. Operation of the Patton IM1/I is transparent to higher network
level protocols such as TCP/IP, DECnet, NETBIOS and IPX. The
Patton IM1/I is 802.3 compliant and supports PPP (Point to point
protocol) with bridging control protocol (RFC 1638).

Once installed in the local Patton base unit, the Patton IM1/I works
in a “plug and play” manner to forward LAN broadcasts, multicasts and
frames destined for the peered Ethernet LAN at the remote end (the
Patton base unit at the remote end must also be equipped with an IM1/I
module). Using the Patton IM1/I, peered Ethernet LANs can be linked
over leased 2-wire/4-wire, DDS, PCM and campus fiber circuits.

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 2 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.

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