3Com 3C888 - OfficeConnect Dual 56K LAN Modem Router, User Manual

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1
I
NTRODUCTION
This chapter provides an overview of the OfficeConnect
®
Dual 56K LAN Modem,
referred to throughout this document as the Dual 56K LAN Modem, or simply as
the LAN Modem.
Introduction
The Dual 56K LAN Modem is an easy-to-install, Local Area Network (LAN) to Wide
Area Network (WAN), analog IP router. The LAN Modem provides four 10BASE-T
Ethernet ports for LAN-side connections and two internal, V.90 ITU 56K-standard
modems for WAN-side connections, plus two additional analog ports for standard
analog equipment such as a phone and/or fax machine.
To configure the Dual 56K LAN Modem, you use a standard web browser on a
computer attached to the LAN Modem to access the LAN Modem’s web-based
configuration screens. Afterwards, you can attach up to three additional
computers directly to the LAN Modem, or a combination of external hubs and
computers, to create WAN access for up to 25 users.
Dial-in and Dial-out
Access
The Dual 56K LAN Modem supports both dial-in and dial-out remote access. This
means that you can use the LAN Modem on either end of a LAN-to-WAN
connection: to call out from your local LAN to an already existing network (such as
the Internet or a private, corporate network), or to receive calls into your LAN from
up to ten previously-defined remote sites. For calls to a private network via the
Internet, where security is a consideration, the LAN Modem also supports
pass-though VPN (Virtual Private Network) tunneling.
Dual 56K Analog
Modems
The V.90 56K ITU standard used on each of the Dual 56K’s internal modems
provides download speeds of up to 56K
1 for each analog line. The two modems
can be accessed independently on a first-come, first-served basis by any
combination of users dialing out from the LAN and users dialing in to the LAN for
separate, 56K connections. Or, the LAN Modem can be configured to provide one
high-speed connection at a time.
The Dual 56K LAN Modem is software upgradeable, allowing for easy upgrades to
new features and enhancements as they become available. Visit the LAN Modem
Web site for the latest firmware releases:
http://www.3com.com/support/docs/lanmodem.
1.Capable of receiving downloads at up to 56 Kbps and sending at up to 31.2 Kbps. Due to FCC regu-
lations, receiving speeds are limited to 53 Kbps. Actual speeds may vary. Requires compatible analog
phone line and server equipment. The Dual 56K LAN Modem complies with the V.90 ITU standard and
is backwards-compatible with all US Robotics 56K standards. Standard officially determined in February,
1998; ratified in September, 1998.