Virtual Console BRI-8U, Руководство пользователя

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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 office. 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 flow 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 configuring “Leased Line” mode.
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User Manual