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6 MultiModemISI Hybrid Series, ISIHI-2S
Chapter 1– Introduction
W
elcome to Multi-Tech’s
new MultiModemISI Hybrid Series, model ISIHI-2S, a multiport hybrid ISDN card for
Remote Access Server (RAS) applications. Included on the ISIHI-2S are four V.90/
K56flex central site modems for incoming analog modem and fax calls, as well as two
terminal adapters. Each terminal adapter appears as two ports to the server PC using the
ISIHI-2S. The terminal adapters identify incoming analog calls and route them to the
central site modems. The card also supports dial-out applications via the modems or
terminal adapters.
The ISIHI-2S card features eight RAS ports using two Basic Rate Interface (BRI) ISDN
lines. The eight ports allow a server to accept any combination of analog modem and
digital ISDN calls, giving the user the flexibility to customize the settings of the terminal
adapters and modems. Since the two BRI lines constitute only four Bearer channels, only
four of the eight ports can be active at any one time. The two terminal adapters handle
the four B-channels as four independent data connections (see diagram below).
RJ-45 jack
Com Ports
Line 1
Line 2
Modem
Modem
Modem
Modem
TA
TA
7
8
3456
3
4
3456
6
2
1
5
ISDN
RJ-45 jack