Multi-Tech Systems ISIHP-2U - Manual (Page 5)

Introduction
MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 5
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 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.
The ISIHP-4SD contains four terminal adapters only (the daughter
card containing the eight modems is absent). Since it accommodates
four ISDN BRI lines (each offering two B-channels), it supports eight
independent digital data connections.
Each terminal adapter appears as two ports to the server PC using the
ISIHP card.
ISIHP cards also support dial-out applications via their modems or
terminal adapters.
The ISIHP-2S/2U card offers eight RAS ports using two Basic Rate
Interface (BRI) ISDN lines; the ISIHP-4S/4U has 16 ports using four
BRI ISDN lines. For the ISIHP-2S/2U, its eight ports allow a server
to accept any combination of analog modem and digital ISDN calls,
making a maximum of four simultaneous independent data
connections. For the ISIHP-4S/4U, its sixteen ports allow a server to
accept any combination of analog modem and digital ISDN calls,
making a maximum of eight simultaneous independent data
connections. This arrangement gives the user the flexibility to
customize the settings of the terminal adapters and modems. The
terminal adapters on the ISIHP-4SD can make eight simultaneous
independent connections.