NEC SL1100 Features And Specifications Manual page 474

SL1100
• B-Channel to Trunk Association
When an Incoming ISDN-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-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
I
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.
1-462
Trunk
Number
9
10
11
12
13
14
15
16
17
18
19
20
21
22
...31
Outgoing Call
Number
B-Channel
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
...23
Network on Channel 23. In most
cases, the Network will control/select
the B-Channel used for an incoming call.
Trunk Trunk Trunk
Group Priority
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
ISSUE 2.0
Incoming call from the
B-Channel
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
ISDN Compatibility