NEC SL1000 Features And Specifications Manual page 443

ISSUE 2.0
• B-Channel to Trunk Association
When an Incoming ISDN-BRI/PRI call is received, the system assigns the lowest trunk number of
the ISDN circuit to the incoming call associated with the B-Channel. When an Outgoing call is
placed using the ISDN-BRI/PRI, the system assigns the Trunk and B-Channel association according
to the chart below. This is based on the Trunk-to-Trunk Group and Trunk Group Priority assignment
in (PRG 14-05-01).
Refer to the charts below for examples(23B):
Incoming Call
Station User
Talking on TK009
Outgoing Call
Station user
places outgoing trunk
all by dialing Trunk
Access code. Outgoing
call is placed on the
associated B-Channel.
In addition to T1/PRI interface ETUs, PRI also requires a CSU/DSU Unit and interconnecting cables to
interface with the Telco.
Features and Specifications Manual
Trunk B-Channel
Number Number
9 1
10 2
11 3
12 4
13 5
14 6
15 7
16 8
17 9
18 10
19 11
20 12
21 13
22 14
...31 ...23
Trunk Trunk
Number Group
9 1
10 1
11 1
12 1
13 1
14 1
15 1
16 1
17 1
18 2
19 2
20 2
21 3
22 3
...31 3
SL1000/SL1100
Incoming call from the
Network on Channel 23. In most
cases, the Network will control/select
the B-Channel used for an incoming call.
Trunk B-Channel
Priority Number
9 1
8 2
7 3
6 4
5 5
4 6
3 7
2 8
1 9
3 10
2 11
1 12
1 13
10 14
...1 ...23
I
1-433