T1/Pri (1Priu) Interface Pcb (Figure 2-38 - Figure 2-39) - NEC UX5000 Hardware Manual

Chapter 2 - PCB Installation and Startup
2.7.7

T1/PRI (1PRIU) Interface PCB (Figure 2-38 - Figure 2-39)

The T1/PRI PCB provides an interface for DS1, T1 and ISDN Primary Rate Interface (PRI) applications. This
PCB has a single 24-channel 64Kb/s digital signal circuit which can be configured for either T1 trunks or PRI.
Each PCB connects to the network via an NTI Network Termination.
If set for T1, the T1/PRI PCB 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 PCB provides 24 PRI (23 B& 1 D) channels running at 1.544Mbps with 64Kb/s
clear channel. The PCB 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 PCB defined as a PRI card 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 PCB uses the first block of 24 consecutive trunk ports. For example, if
you have an COIU PCB installed for trunks 1-8, the T1/PRI Interface PCB will automatically use trunks 9-32. If
you have COIU PCBs installed for trunks 1-8 and 17-24, the T1/PRI PCB will use trunks 25-48. The T1/PRI
Interface PCB cannot use trunks 9-16 (even if available) since they are not part of a consecutive block of 24
trunks. Each T1/PRI PCB requires that 24 ports be available in the system, even if not all the ports will be
used, otherwise the PCB will not function.
A maximum of 2 PRIU PCBs can be installed in the main KSU with the CPU. A maximum of 5 PRIU PCBs (for
T-Point or S-Point) can be installed in a 19" cabinet with a CPU. The T1/PRI PCB requires one universal slot
and provides:
●
1.5M, 2M, or T1 Function
2 - 76 Chapter 2