Multi-Tech Systems ISIHP-4SD, ISIHP-4U manual Introduction

Introduction

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.

MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 5