Panasonic DBS Section 540 Reference Manual page 18

System Planning Forms and Guidelines
Example
In this example call traffic is not expected to exceed 8 simultaneous calls.
Eight trunks for calls between any two DBS systems should be adequate.
However, under the T1 configuration being considered, a call can be relayed
by an intermediary DBS. In this case, a call will pass through one DBS to get
to another. Therefore a maximum of 16 network trunks between any two
systems should be enough. All remaining T1 trunks may be split off to handle
CO calls. Figure 2-5 illustrates the determined network trunk configuration.
Figure 2-5. Example Networking Trunking Configuration
DBS 1
1XXX
DBS 4
4XXX
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16 Tie Trunks
16 Tie Trunks
16 Tie Trunks
T1 Networking - Revised April 2000
System Planning
DBS 2
2XXX
16 Tie Trunks
DBS 3
3XXX
DBS-2.3/9.2-540