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SOHO environment because

ISPs typically assign a single IP

address for each location when

dialing in for service. NAT

allows each station attached to

the ISDN router to share the

same IP address for communica-

tion with the outside world. The

source address of any packet

forwarded out from a small

office LAN is mapped to the

temporary IP address assigned

to the ISDN router by the ISP.

Likewise, any packets directed

inward to the small office LAN

will have the temporary IP

address assigned to the router as

the destination address. The

router then needs to determine

which station should receive the

packet. The quality of NAT

implementations differs, which

could cause certain applications

not to work.

Beyond support for core appli-

cations, like FTP downloads, an

ISDN router should offer support

for up and coming applications

such as virtual collaboration/

multimedia and secure access/

VPN applications. Furthermore,

for troubleshooting purposes, an

ISDN router should offer

diagnostics support.

The Tolly Group verified the

3Com LAN Modem’s capability

of forwarding traffic across all

Internet applications tested with

“Intelligent NAT” enabled. The

3Com LAN Modem was tested

using a battery of nine Internet

applications in order to demon-

strate the device’s ability to

properly map packets back to the

correct address. See figure 1.

Client stations located behind

the 3Com LAN Modem were

able to exchange data with sta-

tions on a private corporate net-

work or log onto the Internet

without any additional configu-

ration of the 3Com LAN

Modem. Rival ISDN routers

evaluated required either addi-

tional configuration, or, did not

support the Internet application

used during testing.

The Pipeline 75 offered support

for all applications tested except

NetMeeting, CU-SeeMe, and

one and two PPTP tunnels. It

supported the RealPlayer appli-

cation, but only when config-

ured to use TCP packets (UDP

is the default for RealPlayer).

The Cisco 776 ISDN Access

Router also offered support for

all applications tested except

NetMeeting, CU-SeeMe, and

one and two PPTP tunnels.

Clients behind the Cisco 776

ISDN Access Router were

unable to receive video from

their partners and no audio

signals were exchanged

between the clients. Incoming

NetMeeting and CU-SeeMe

calls were not accepted.

Furthermore, Cisco says

NetMeeting is supported when

NAT is turned off and static

addresses are used and that

CU-SeeMe is also supported

using static addresses. Cisco

has no plans to support PPTP

for the Cisco 776 ISDN Access

Router at this time.

The NETGEAR RT328 ISDN

Router supported all appli-

cations tested except

NetMeeting and CU-SeeMe.

With NetMeeting and CU-

SeeMe, only one client

The Tolly Group 3Com Corp. OfficeConnect LAN Modem

3Com Corp.

OfficeConnect LAN Modem

Product Specifications*

m Internet and corporate remote access for

SOHO users

m Up to 25 users can share a single ISDN

line for simultaneous shared access to the

Internet or remote corporate network

m Intelligent Network Address Translation

(NAT) allows users to economically and

securely share a single ISP account while

maintaining full interoperability with

Internet applications

m Multiple Destination Support allows users

to access two separate destinations simul-

taneously such as an ISP and a private

corporate network

m Browser-based installation and configu-

ration using a standard Web browser and

built-in Web wizard

m Point-to-Point Tunneling Protocol (PPTP)

creates secure, cost-effective virtual private

network connections over the Internet

m Multilink PPP combines the bandwidth

of two ISDN “B” channels for speeds of

128 Kbit/s

m Call Bumping adds or drops ISDN “B”

channels dynamically to allow additional

data or voice calls

m Supplementary voice features offer full

support for caller ID, call waiting, call

transfer, etc.

For more information contact:

3Com Corporation

5400 Bayfront Plaza

Santa Clara, CA 95052-8145

Phone: 1-800-NET-3COM

URL: http://www.3com.com

*Vendor-supplied information not verified

by The Tolly Group

3Com Corp.

OfficeConnect

LAN Modem

Functionality

and

Performance

1 2 3 4 5 6 7 8

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