Nortel Networks 311

Functional description 381

The power on the DSL comes from the SILC, which accepts –48 V from the

IPE backplane and provides two watts of powerto physical terminations on

each DSL. It provides -48 V for ANSI-compliant ISDN BRI terminals and

–40 V for CCITT (such as ETSI NET-3, INS NET-64) compliant terminals.

The total power used by the terminals on each DSL must not exceed two

watts.The S/T interface logic consists of a transceiver circuit and the DSL

power source. This interface supports DSLs of different distances and

different number and types of terminals.

The transceiver circuits provide four-wire full duplex S/T bus interface.

This bus supports multiple physical terminations on one DSL where each

physical termination supports multiple logical B-channel and D-channel

ISDN BRI terminals. Idle circuit-switched B-channels can be allocated for

voice or data transmission to terminals making calls on a DSL. When those

terminals become idle, the channels are automatically made available to

other terminals making calls on the same DSL.

The power on the DSL comes from the SILC,which accepts -48 V from the

IPE backplane and provides 2 watts of power to physical terminations on

each DSL. It provides -48 V for ANSI compliant ISDN BRI terminals and -40

V for CCITT (such as ETSI NET-3, INS NET-64) compliant terminals. The

total power used bythe ter minals on each DSLmust not exceed 2 watts.

The S/T interface logic consists of a transceiver circuit and the DSL power

source. This interface supports DSLs of different distances and different

numbers and types of terminal.

The transceiver circuits provide four-wire full-duplex S/T businterface.

This bus supports multiple physical terminations on one DSL where each

physical termination supports multiple logical B-channel and D-channel

ISDN BRI terminals. Idle circuit-switched B-channels can be allocated for

voice or data transmission to terminals making calls on a DSL. When those

terminals become idle, the channels are automatically made available to

other terminals making calls on the same DSL.

The power on the DSL comes from the SILC, which accepts –48 V from the

PE backplane and provides 2 watts of powerto physical terminations on

each DSL. It provides -48 V for ANSI-compliant ISDN BRI terminals and –40

V for CCITT (such as ETSI NET-3, INS NET-64) compliant terminals. The

total power used bythe ter minals on each DSLmust not exceed 2 watts.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23May 2008