KX-NS5282X, KX-NS5284X - Panasonic PBX Service Manual (repair manual). Page 8

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The reference point of the line interface on the BRI2/4 cards is Point S/T (Dose not support U point). and supports External call
mode and internal call mode as operating mode.
During internal call mode, PSB21150 (Infineon) is installed as ISDN basic interface IC for BRI2/4. 
For mode detailed specifications, refer to PSB21150 data sheet.

Line Interface Summary.

PSB21150 Block figure summary

PSB21150 Characteristics

Item

Contents

Remarks

Interface reference point

S/T point

 

Transmission mode

4 line (TX+/TX-/RX+/TX-)

 

Transmission capacity

144kbps, 2B+D(B=64kbps, D=16kbps)

BRI2/4:line capacity

Transmission Line code

AMI Code

 

Interface connector

RJ45

Item

Contents

Remarks

Transceiver mode

LT-T (External)/LT-S(Internal)

 

Line Extraction Clock

1.536MHz

 

Dch FIFO

32Byte

2

TX/RX

Bch FIFO

64Byte

2 (2)

TX/RX

IOM-2interface

2.048Mbps (Bch/Dch dual interface) 

uP-interface

8bit parallel (Intel/Motorola)

Intel mode is used for BRI2/4