KX-NS5282X, KX-NS5284X - Panasonic PBX Service Manual (repair manual). Page 9

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This card utilizes an 2.048 Mbps local highway and local TSW for the purpose of switching the communications channel (B ch.)
detected from the ISDN main interface by the PSB21150, and 4.096 Mbps local highway and local TSW for the purpose of switching
the SLC.
Figure illustrates the SLC and B ch. Highway assign and Main Board/SLC/PSB21150 input/output timing. 

Local Serial

Data Rate

4.096Mbps

Highway(4M)

Reference Clock Rate

4.096MHz(Single Rate)

Number Of Timeslots

64

8kHz Frame Width

Equals to 1 Reference Clock.

Local Serial

Data Rate

2.048Mbps

Highway(2M)

Reference Clock Rate

4.096MHz(Double Rate)

Number Of Timeslots

32

8kHz Frame Width

Equals to 8 Reference Clock.