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WAN Backbone/X.25

non- X.s5

Async devices

Branch Location

Central site

ARN

w/X.25 PAD

Router

X.25

3745

X.25 Host

including the generation of and

response to ITU-T V.54 Remote

Loopback—allow network administra-

tors to readily pinpoint WAN connec-

tion difficulties with either router,

DSU, or WAN facilities. This makes

the ARN easier to troubleshoot.

V.34 modem

When Switched 56 or ISDN BRI

services are not available or considered

cost-effective, the ARN router’s inte-

gral V.34 modem adapter module can

be used to support Nortel Networks

dial services capabilities. Modem

adapter module speeds range from

1,200 bps to 115,200 bps on standard

analog telephone lines. Providing nomi-

nal speeds of 28.8 kbps, the V.34

modem’s standard V.42bis compression

capabilities boost throughput to 115.2

kbps or greater. Standard V.42 and

MNP 10 error correction capabilities

also ensure reliable transmission of

mission-critical data.

X.25 PAD

The ARN X.25 PAD option provides

support for legacy applications that use

the X.25 protocol for communications.

Retail and banking customers are

typical users of X.25. Many customers

are planning to replace their X.25

backbone network with a more cost-

effective backbone network—such as

Frame Relay—using IP. The ARN PAD

option offers the capability to these cus-

tomers to migrate to an IP-based net-

work. The PAD can use the IPEX fea-

ture to forward the packets destined to

an X.25 host via a non-X.25 WAN

backbone, such as Frame Relay. Or, the

PAD can present X.25 data directly to

an X.25 WAN backbone. Figure 3 illus-

trates a typical X.25 PAD application.

Auxiliary remote expansion

modules

The ARN router’s optional expansion

modules allow the router to be config-

ured to support a second LAN inter-

face (Ethernet or Token Ring) and/or

three or seven serial (Synchronous/

Asynchronous) interfaces. Along with

the new ARN Ethernet/Multiserial

and 7-serial expansion modules,

options include Tri-Serial, Ethernet,

Ethernet plus Tri-Serial, Token Ring,

or Token Ring plus Tri-Serial. The

expansion module’s serial interfaces

provide three connections for synchro-

nous or asynchronous WAN circuits

and/or legacy devices.

Similar to the base module of the

ARN, Ethernet-based expansion

modules can be continuously

monitored through use of the

Nortel Networks DCM.

Power options

The ARN is available with one 100

to 240 VAC power supply or one -48

VDC to -60 VDC power supply.

Maximized connectivity and

interoperability via BayRS

The ARN runs BayRS router software

to maximize efficiency for remote office

connectivity in multivendor, multipro-

tocol environments and supports all

major network and bridging protocols.

Software options

Three different levels of software are

available for the ARN router, including

IP Access, Remote Office, and

Corporate (see Table 3 at the end of

this document). This allows the ARN

to be configured with software that

best fits the remote site’s requirements.

Traffic management

Comprehensive traffic management

capabilities are provided to the ARN

router through the use of BayRS Data

Compression, Traffic Prioritization,

and Uniform Traffic Filters.

Data Compression

Configurable on a per-circuit or link

basis, Nortel Networks software-based

Data Compression feature is supported

by all Nortel Networks routers,

maximizing internetwork performance

by reducing the amount of bandwidth

required to transport traffic over the

WAN. Data Compression is supported

over Frame Relay, X.25, and PPP

(over leased lines and dial-up analog or

ISDN links), maximizing throughput

over ARN full-duplex WAN links.

Traffic Prioritization

To ensure the highest quality of

service, Traffic Prioritization allows

high-priority delivery to be assigned to

time-sensitive and/or mission-critical

traffic. Traffic Prioritization reduces the

occurrence of session timeouts and

improves application response times.

Priority filters can be configured to

Figure 3: Typical X.25 application

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