User guide

9
Chapter 1 - Introduction
1.1.2 ISIHP-4S/4U Serial Card
From the perspective of the server PC, the ISIHP-4S/4U is an sixteen-port serial card with sixteen devices
permanently attached to the serial ports (Figure 1-2).
3456
RJ-45 Jack
TA
Modem
Modem
9
1
2
10
3456
RJ-45 Jack
TA
Modem
Modem
11
3
4
12
3456
RJ-45 Jack
TA
Modem
Modem
13
5
6
14
3456
RJ-45 Jack
TA
Modem
Modem
15
7
8
16
Figure 1-2. Modems and Terminal Adapters
of ISIHP-4S/4U (for ISIHP-4SD, no modems are present)
The first eight ports are the four terminal adapters, each of which appear as two ports. The remaining eight
ports are the eight central site modems. Table 3 summarizes the correlation of ports and devices. The ISIHP-
4SD contains terminal adapters only; no modems are present.
Table 3: 4S/4U Ports and Devices
4S/4U Device ISDN Line
Port # Number
1TA1
2TA1
3TA2
4TA2
5TA3
6TA3
7TA4
8TA4
9 Modem 1
10 Modem 1
11 Modem 2
12 Modem 2
13 Modem 3
14 Modem 3
15 Modem 4
16 Modem 4