User manual

About your ISDN Simulator
Virtual Console’s ISDN simulator is a two port ISDN switch that provides call switching services for Basic
Rate Interface (BRI) terminal equipment. All our ISDN simulators conform to the ISDN architecture and to
individually programmable switch types (Table 1). Our products are extensively used with Cisco equipment
and are tested for compatibility with most of the ISDN-capable Cisco routers, including the 1600, 1700, 2500,
2600 and 3600 series.
Table 1: Switch Types Emulated
Switch Type Cisco conguration command SPID required
National ISDN-1 isdn switch-type basic-ni1 Yes
NET3 isdn switch-type basic-net3 No
AT&T 5ESS isdn switch-type basic-5ess Optional
Nortel DMS-100 isdn switch-type basic-dms100 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 NT1) and Terminal Adapters (TA).
To a TE1 or TA, the simulator provides the S/T interface. To an NT1, it provides the U interface. Over these
physical interfaces (Figure 2) ow the protocols described in Figure 3.
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