KX-NCP1280XJ - Panasonic PBX Service Manual (repair manual). Page 7

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The reference point of the line interface on the BRI2 cards is Point S/T (Dose not support U point). and supports External call
mode and internal call mode as operating mode.
During External call mode, the power is supplied from PBX, not from DSU. During internal call mode, PSB21150 (Infineon) is
installed as ISDN basic interface IC for BRI2. Refer to "Line Interface Block" for connection diagram of basic interface.
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:line capacity

Transmission Line code

AMI Code

 

Power Supply

External call mode: None Internal call mode:+40V power
supply

 Internal call power supply BRI2: 4.5W max/1line,
9W max/entire card

Internal call power supply
method

Phantom power supply Separate line power supply

 

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

PCM highway interface

2.048m (Bch interface only) 

JOM-2interface

2.048m (Bch/Dch dual interface) 

Not in use for BRI2

uP-interface

8bit parallel (Intel/Motorola)

Intel mode is used for BRI2