NEC Aspire Product Description page 89

When installed, the T1/PRI Interface PCB uses the first block of 24 consecutive trunks. For example, if
you have an 8COIU PCB installed for trunks 1-8, the T1/PRI Interface PCB will automatically use
trunks 9-32. If you have 8COIU PCBs installed for trunks 1-8 and 17-24, the T1/PRI PCB will use
trunks 25-48. The T1/PRI Interface cannot use trunks 9-16 (even if available) since they are not part of a
consecutive block of 24 trunks.
Trunk Number Translation for Channel ID Based on Trunk Group Number
The Channel ID of an incoming SETUP message on a PRI line is related to the trunk group number. The
system will create the trunk line number as the lowest trunk port number in the range of the same trunk
group related to the channel number of the Channel ID information element of an incoming call's
SETUP message.
For example, referring to the chart below, the system translates the call as being trunk port 4.
Notes:
Basic Rate Interface (BRI)
Your system also provides compatibility with ISDN Basic Rate (BRI) services, including:
BRI services require the installation of BRI Interface PCBs (2BRIU P/N 0891006, 4BRIU P/N
0891007, 8BRIU, P/N 0891008). Each 2BRI Interface PCB has two BRI circuits. The 4BRI Inter-
face PCB has four BRI circuits, while the 8BRI has eight BRI circuits. The BRI Interface PCBs use
a single universal slot.
Each BRI Has Two TEI's
For each BRI line, two different TEI's will be assigned to two different SPID's.
Product Description
Trunk
Number
1
2
3
4
5
6
7
8
9
. . . 23
In addition to T1/PRI Interface PCBs, PRI also requires a CSU/DSU Unit and interconnecting
cables to interface with the telco.
Each T1/PRI Interface PCB is switch selectable between T1 and PRI operation. For more on
T1 Trunking, go to "T1 Trunking (with ANI/DNIS Compatibility)".
Basic BRI Call Control (BCC)
Point-to-Point BRI Terminal Connection (no daisy-chaining)
Multipoint BRI Terminal Connection (daisy-chaining)
S-Bus (allows BRI PCB's to be used as either a trunk or station interface)
Trunk Channel
Group Number
1 1
1 2
1 3
2 4
2 5
2 6 <--- Incoming Call
2 7
5 8
5 9
. . . 5 . . . 23
Section 3: Features
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