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the Internet and private net-

works — while other

competing products can only

connect to one network.

Problems often arise when

multiple users attempt to

access multiple destinations

simultaneously across a router.

Many LAN routers allow a sin-

gle connection to use both

ISDN B channels for improved

performance but if another

user attempts to connect to a

different location through the

router at that time, the connec-

tion attempt will fail.

One solution to this problem is

“data call bumping,” which

reallocates one of the two

active B channels to a new

connection. Essentially, the

3Com LAN Modem can split

apart a 128 Kbit/s connection

going to one location into two

64 Kbit/s connections heading

to separate locations. This fea-

ture is not only transparent to

the users, it increases the pro-

ductivity of the SOHO users

by optimizing the use of all

available ISDN lines.

Application

Throughput

Application throughput is an

important measurement of an

ISDN router’s performance

because it identifies the actual

throughput experience of the

user. Test results show that the

3Com LAN Modem provides

high-throughput levels in all

scenarios. This indicates its

high-performance capabilities

in a SOHO environment. When

compression was enabled, the

3Com LAN Modem’s perfor-

mance improved up to 80%

when forwarding text traffic.

Testing was conducted to see

what effect compressing pre-

compressed data had on

throughput performance.

Traditionally, throughput often

decreases when the device

attempts to compress non-

compressible data; however, the

3Com LAN Modem maintained

virtually the same throughput

with pre-compressed data

whether compression was

turned on or off.

Test Configuration and

Methodology

The Tolly Group tested the

ISDN routers at the following

code levels: 3Com’s Office

Connect LAN Modem (system

software version 5.2.0B2Jb,

boot software version 5.0.2);

Ascend’s Pipeline 75 (software

version 6.1.7, access router

version b2a.p75); Cisco’s 776

ISDN Access Router (software

version c760-i.b US 4.2(3);

ISDN Stock revision US 2.10

(5ESS/DMS/NI-1); Nortel’s

NETGEAR RT328 ISDN

Router (software version

V1.50(c.00); boot driver ver-

sion P426), Ramp’s WebRamp

410i (build 118).

For a complete understanding

of the Test Methodology visit

The Tolly Group’s Web site

and access document 199110.

Due to space constraints in this

report, the entire Test

Methodology is available on-

line to preserve the full extent

of testing details. See figure 6

for a test bed diagram.

Equipment

Acquisition and

Support

The Ascend, Cisco and Nortel

products were acquired through

normal distribution channels.

The Ramp product was pro-

vided to The Tolly Group by

Ramp Networks as an evalua-

tion unit. The Tolly Group

contacted executives at all

companies and invited them to

provide a higher level of

support than available to cus-

tomers through normal chan-

nels. All vendors accepted The

Tolly Group’s invitation.

The Tolly Group verified

product release levels and

shared test methodologies

with the vendors in order to

give them an opportunity to

properly configure their

devices. All vendors assisted

The Tolly Group with device

and GUI setup. The results

were shared with the competi-

tive vendors and the vendors

acknowledged their accuracy.

For a more complete under-

standing of the interaction

between The Tolly Group and

the competitive vendors, check

out the Technical Support

Diary for Competitive Products

Tested posted on The Tolly

Group’s World Wide Web site

at http://www.tolly.com. See

document 199110.

The Tolly Group 3Com Corp. OfficeConnect LAN Modem

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