Chapter 2 - Blade Installation and Startup
2.7.7
T1/PRI (1PRIU) Interface Blade (Figure 2-41 - Figure 2-42)
The T1/PRI blade provides an interface for DS1, T1 and ISDN Primary Rate Interface (PRI) applications. This
blade has a single 24-channel 64Kb/s digital signal circuit which can be configured for either T1 trunks or PRI.
Each blade connects to the network via an NTI Network Termination.
If set for T1, the T1/PRI blade gives the system 24 trunks in a single universal slot. These trunks can be one of
the following:
Loop Start
●
Ground Start
●
DID
●
●
E&M Trunks
ANI/DNIS E&M Trunks
●
T1 gives the system the advantages of advanced digital trunking as well as conserving universal slots. For
example, a system with 12 loop start trunks, two tie lines and six DID trunks would use up five universal slots.
With T1 all these trunks would be available in a single universal slot, freeing up four additional universal slots
for other uses.
If set for PRI, each T1/PRI blade provides 24 PRI (23 B& 1 D) channels running at 1.544Mbps with 64Kb/s
clear channel. The blade supports the following PRI services:
Basic PRI Call Control (BCC)
●
Display of incoming caller's name and number (when allowed by the telco)
●
Speech and 3.1 KHz audio
●
By default, the system programming has an installed T1/PRI blade defined as a PRI blade in system
programming. System programming is also used to define whether the connection is T-Point or S-Point.
When installed, the T1/PRI Interface blade uses the first block of 24 consecutive trunk ports. For example, if
you have an COIU blade installed for trunks 1-8, the T1/PRI Interface blade will automatically use trunks 9-32.
If you have COIU blades installed for trunks 1-8 and 17-24, the T1/PRI blade will use trunks 25-48. The T1/PRI
Interface blade cannot use trunks 9-16 (even if available) since they are not part of a consecutive block of 24
trunks. Each T1/PRI blade requires that 24 ports be available in the system, even if not all the ports will be
used, otherwise the blade will not function.
A maximum of 2 PRIU blades can be installed in the main chassis with the CPU. A maximum of 4 PRIU blades
(for T-Point or S-Point) can be installed in a 19" chassis with a CPU. With the CygniLink feature, a maximum of
8 PRIU blades can be used. The T1/PRI blade requires one universal slot and provides:
1.5M or T1 Function
●
2 - 86
9.5"
19" Chassis
Chassis
w/CCPU
2
4
- P/N 0911052
Blade Maximum's
19" Chassis
19" Chassis
w/o CCPU
4
System Max.
x4
w/Networking
16
Trunk: 8
Station: 21
Chapter 2