PA-24PRTB-A

Primary Rate Interface Trunk

PA-24PRTB-A

Primary Rate Interface Trunk

1.General Function

The PA-24PRTB-A (PRT) circuit card is a digital interface supporting voice and data communications at 1.5 M bit/sec. Being equipped with a Link Access Procedure for a D channel (LAP D) controller based on the ITU-T I/Q series, this card provides a Primary Rate Access Interface (PRI) with the system. A built-in resonance circuit extracts clock signals, which are supplied from the network, so that the system may be in exact synchronization with the network. To obtain appropriate speech level, this card is also equipped with a mask ROM in which typical PAD patterns have been already written. A desired PAD value can be easily selected by key settings and programming from the MAT.

INT

I/O Local Bus

CPU

TSW

Speech Path (PCM Signal)

D-channel Signaling Link

INT

 

 

 

24ch

 

 

2-wire

 

 

T

ISDN

 

2-wire

 

NETWORK

 

R

 

 

 

24PRT

 

 

1.544MHz Clock

 

System Clock

Extraction from Network

 

 

 

 

PLO

 

Figure 3-181 Location of PA-24PRTB-A (24PRT) within the System

CHAPTER 3

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NEC 2400 ipx manual PA-24PRTB-A, Primary Rate Interface Trunk

2400 ipx specifications

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