4.19.11. BChanId (B Channel Identifier)

Description: The BChanId parameter defines the initial B channel in the set to which the TSC instance is associated. It is also the channel to which the initial time slot, defined by SlotId, will be mapped. B channels are then sequentially mapped to time slots for a count of Count.

For example, on a T-1 board where the D channel is mapped to time slot 24 on all four lines, BChanId and SlotId are set to a value of 1 and NumChans is set to a value of 23. This defines 23 B channels numbered 1 to 23 mapped to time slots 1 to 23.

defineBSet=10,1,1,23,0,1,1,1,20,1, 1,1,3,23,0
defineBSet=20,2,1,23,0,1,1,2,20,1, 1,1,3,23,0
defineBSet=30,3,1,23,0,1,1,3,20,1, 1,1,3,23,0
defineBSet=40,4,1,23,0,1,1,4,20,1, 1,1,3,23,0 

For E-1 ISDN lines that usually contain a D channel mapped to time slot 16, the mapping of channels to time slots occurs in two sets of BChanId, SlotId, Direction and Count definitions. The first set of definitions map time slots before the D channel and the second set maps time slots after the D channel.

For example, on an E-1 ISDN board with four network interfaces, where time slot 16 is used for signaling on all four lines, BChanId would be defined on each line as follows:

defineBSet=10,1,1,30, 0,1,1,1,20,1, 1,1,3,15, 16,17,3,15,0
defineBSet=20,2,1,30, 0,1,1,1,20,1, 1,1,3,15, 16,17,3,15,0
defineBSet=30,3,1,30, 0,1,1,1,20,1, 1,1,3,15, 16,17,3,15,0
defineBSet=40,4,1,30, 0,1,1,1,20,1, 1,1,3,15, 16,17,3,15,0 

In this example, channels 1 to 15 are mapped to time slots 1 to 15 and channels 16 to 30 are mapped to time slots 17 to 31.

For E-1 clear channel lines where the time slot 16 is not used for signaling, additional defineBSet commands are added to clear channel 31. Both StartChan and BChanId are set to a value of 31, NumChans and Count are set to a value of 1, and SlotId is set to 16 as follows:

defineBSet=50,1,31,1, 0,0,0,1,21,1, 31,16,3,1,0
defineBSet=60,2,31,1, 0,0,0,1,21,1, 31,16,3,1,0
defineBSet=70,3,31,1, 0,0,0,1,21,1, 31,16,3,1,0
defineBSet=80,4,31,1, 0,0,0,1,21,1, 31,16,3,1,0 

Values:

• 1 to 24 (T-1)
• 1 to 31 (E-1)

Click here to contact Telecom Support Resources