NEC Aspire Manual page 136

Section 3: Features
1. Each T1/PRI Interface PCB provides 23 voice (B) and 1 data (D) channel.
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Primary Rate Interface (PRI)
The system is compatible with ISDN Primary Rate Interface (PRI) services. PRI services currently
supported include:
●
Basic PRI Call Control (BCC)
● Display of incoming caller's name and number when allowed by telco
● Routing in the system based on the number the caller dialed
● ISDN maintenance functions (such as In Service/Out of Service Messaging)
● Speech and 3.1 KHz audio
PRI capability requires the installation of T1/PRI Interface PCBs (0891009). Each PCB (also called a
PRI circuit) provides 24 PRI channels (23B + D)
face PCB uses a single slot.
When installed, the T1/PRI Interface PCB uses the Þrst 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.
Notes:
● 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)".
Two B-Channel Transfer for PRI
Depending on your software, the system may have the ability for a keyset or single line telephone
to use the optional "Two B-Channel Transfer for PRI" service provided by some National ISDN
carriers in the U.S. (comparable to an analog centrex).
This service supports trunk-to-trunk transfer on the telco side. With this option enabled, two trunk
calls on the Aspire system can be connected together by the telco, releasing the trunks from the
Aspire and connecting the outside parties together.
The Aspire can perform a trunk-to-trunk transfer in the following cases:
● Put a PRI trunk call on hold and call/answer another PRI trunk. Press the Transfer
(Program 15-07 or SC 851: 06) or CONF key.
The status and bearer capability of the two trunks both meet the service requirements.
● Put a PRI trunk call on hold and call/answer another PRI trunk, then go on-hook
(Program 20-11-21 must be enabled "0").
The status and bearer capability of the two trunks both meet the service requirements.
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with 64K Clear Channel response. The T1/PRI Inter-
Product Description