User guide

Introduction
8 MultiModemISI Hybrid Server Cards, ISIHP & ISIHI Series
The ISIHP-4SD is a serial interface card equipped with four terminal
adapters only (no analog modems are present). The ISIHP-4SD is
otherwise like the ISIHP-4S/4U models.
The ISIHP-2S/2U contains two terminal adapters and four V.90/
K56flex modems. The ISIHP-2S/2U uses two ISDN BRI lines (each
offering two B-channels) to connect to the telco and these connect to
its two built-in terminal adapters. In addition to handling ISDN calls,
each terminal adapter can detect analog modem and fax calls. When
analog calls are detected, they are automatically connected to one of
the four V.90 modems on the ISIHP board. In this way, these hybrid
cards can handle either ISDN calls or analog modem calls. Although
the ISIHP-2S/2U contains four ISDN TA ports and four analog
modem ports, only four ports can be active at any one time (because
only four B-channels are present). See Figure 1-1. The ISIHI-2S/2U
function like the ISIHP-2S/2U units but have an ISA-type bus which
requires manual setting of the I/O address and the interrupt request
(IRQ).
The ISIHP-4S/4U works like the ISIHP-2S/2U but contains four
terminal adapters and eight V.90/K56flex modems. The 4S and 4U
models each accommodate four ISDN BRI lines. The configuration of
modem and TA ports for the 4S and 4U models is shown in Figure 1-
2.