Nortel Networks 1000 User Manual
Page 375
Functional description
375
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 by the terminals on each DSL must 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 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 PE 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 by the terminals on each DSL must not
exceed 2 watts.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.