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4-22 IMACS System Release 5.1.6 Server Cards
Model No.
Running Head
Configuring ISDN Features ACS-PRI/BRI Card
4.4.2 Assigning B Channels
Choosing the “Bmap” option from the D channel configuration screen of the ISDN card screen
brings up the subscreen shown in Figure 4-10. This figure shows a typical “Bmap” screen. It
is a detailed map of all the WAN timeslots available to users as potential B channels.
When D channel #1 is placed in the “Configure” mode, the system recognizes the assignment
of WAN 1-1, timeslot #24 to this D channel and places it on the Bmap in the proper location.
Notice that since all WAN links are T1 interfaces, the Bmap shows the last 7 places with a
dash (-) indicating that the timeslot is unavailable for assignment.
Additionally, timeslots that are already in use by other resources (e.g. user ports and
cross-connect) are “blocked-out” with the letter “x” in the appropriate WAN timeslot. This
letter “x” means that these timeslots are used as DS0s, and thus are not available for use as B
channels. In Figure 4-10, timeslots 14-19 on WAN 1-1 and timeslots 4-9 on WAN 1-2 are in
use as DS0s and thus are unavailable for assignment.
Figure 4-10. Basic Bmap Screen