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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.

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2-port ISDN Basic Rate Interface card. EURO-ISDN/ETSI compliant.

This card is not available in some countries/areas.

4-port ISDN Basic Rate Interface card. EURO-ISDN/ETSI compliant.

Accessories (included): Spacer x 3, slot cover x 1
User-supplied (not included): RJ45 connector, Twisted pair cable

When connecting this optional service card to the trunk, connect through an NT1; do not connect to the U interface of the trunk
directly.

• This optional service card has 100 

 of terminal resistance. For use in point to multi-point connection, the card must be placed at

the end of the bus.

• This optional service card can be used for either trunk or extension connection, by setting the A/B switch or using the connector

with appropriate pin assignments.

A/B

Slide

Select A (default) for trunk or B for extension use.