Telephone User Manual

Installation Guidelines
Revised April 2000 DBS-EX23-530 2-5
Trunk Assignments for Single-Cabinet Systems
• Programming is not required to associate trunk ports with slot locations.
However, you must use programming to specify that a combination of
ISDN and analog trunks is installed, and you must also specify how many
ISDN channels are used.
• Fractional ISDN per port assignments require the VB-43511A version of
the loop start trunk card. The older VB-43511 version may be used with
fractional ISDN but requires that the trunks be assigned in blocks of 8.
Table 2-2. ISDN and analog trunk assignments, DBS 40
Table 2-3. ISDN and analog trunk assignments, DBS 72
Trunk
Number
Fractional ISDN
using 16 Channels
Fractional ISDN
using 8 Channels
1 ISDN channel 16 Analog trunk 1
↓↓ ↓
8 ISDN channel 9 Analog trunk 8
9 ISDN channel 8 ISDN channel 8
↓↓ ↓
16 ISDN channel 1 ISDN channel 1
Note: Since the DBS 40 supports a maximum of 16 trunks, all 23
channels of the ISDN cannot be used.
Trunk
Number
23-Channel ISDN Fractional ISDN
using 16 Channels
Fractional ISDN
using 8 Channels
1 Analog trunk 1 Analog trunk 1 Analog trunk 1
2 ISDN channel 23 Analog trunk 2 Analog trunk 2
↓↓ ↓ ↓
8 ISDN channel 17 Analog trunk 8 Analog trunk 8
9 ISDN channel 16 ISDN channel 16 Analog trunk 9
↓↓ ↓ ↓
16 ISDN channel 9 ISDN channel 9 Analog trunk 16
17 ISDN channel 8 ISDN channel 8 ISDN channel 8
↓↓ ↓ ↓
24 ISDN channel 1 ISDN channel 1 ISDN channel 1