User manual

Table 1: Switch Types Emulated

Switch Type SPID required

National ISDN-1 Yes

NET3 No

AT&T 5ESS Optional

Nortel DMS-100 Yes

Figure 1: ISDN Functional Architecture

The ISDN simulator appears to the customer-side Functional Groupings as the Loop Termination (LT) at

the telephone central ofce. These Functional Groupings, examples of which are shown in, include ISDN-

compliant Terminal Equipment (TE1), Network Terminations (NT1 and NT2) and Terminal Adapters (TA).

To an NT1 or NT2, the simulator provides the “U” interfaces.

Over these physical interfaces ow the protocols described in Figure 2.

While Q.931, the ISDN primary “dialing” protocol, usually is used to set up dynamic ISDN calls, ISDN simulator

also supports semi-permanent “nailed up” B channels that act like private leased lines. Refer to ISDN Manager

chapter for conguring “Leased Line” mode.

User Manual