KX-NS0290CE - Panasonic PBX Service Manual (repair manual). Page 8

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The reference point of the line interface on the PRI30 card is Point S/T (Point U is not supported.) and the external and internal
line modes are supported as operating mode.
Also, the PRI23/PRI30 cards employ the PRI-IC (IC501) as the IC for Interface. See the "Line Interface Block" or the outline of
the interface connection. Shows the characteristics of the PRI-IC.
See the PRI-IC data sheet for detailed specifications.

Characteristics of the PRI-IC

This card has a relay for loopback test on the primary side of the line to cut and divide into the line failure or the PBX's own fail-
ure, when there is a defect in operation.
Shows The outline diagram of the line interface loopback.

Outline diagram of the line interface

This card has the local highway at 2.048Mbps rate and local TSW in order to switch the talk channel (Bch), which is extracted
from ISDN primary rate by PRI-IC (IC501).
Also, the highway assignment is different for that the number of Bch differs in 2.048M system and 1.544M system. Shows the
highway timing.
For more information, see PRI-IC (IC501) databook.

Highway timing

Item

Contents

Remarks

Line Extraction Clock

2.048MHz

 

DPLL

Low Jitter DPLL for clk generation 

 

Elastic Buffer

Programmable elastic buffer (Rx & Tx)

 MAX  512kbit

Signaling Controller

• HDLC Controller 
• CAS Controller
• Multiframe synchronization and synthesis ITU-T G.732 

 

FIFO

64Byte x 2

 

PCM Highway Interface

2.048Mbps Highway Interface

 

µP-Interface

8bit parallel Bus (Intel)