363-206-305
Circuit Pack Descriptions
Issue 3 June 2000
7-55
Figure 7-22. BBF8 HDSL Circuit Pack
General Description of Operation
7
Figure 7-23 provides an overall block diagram of the HDSL circuit pack. The BBF8
circuit pack provides an HDSL interface capability on the DDM-2000 FiberReach
Multiplexer. HDSL is an access technology that allows the transport of DS1
payloads over metallic twisted pairs. This technology performs an inverse
multiplexing function which splits the DS1 payload into two 784 Kb/s data streams.
These two data streams are combined at the far-end to reconstruct the original
DS1 payload. Both directions of transmission are carried on each twisted pair.
HDSL is a point-to-point transmission technology between two nodes. One of the
nodes (master) is responsible for establishing communications over the
PairGain
proprietary embedded operations channel (EOC). The EOC is required for
synchronizing the two HDSL data streams as well as providing OAM&P between
the two nodes. The other node (slave) may only retrieve or view these parameters.
In each pair of HDSL nodes there must be one master and one slave.
The HDSL signal format used by the BBF8 is compatible with
PairGain
HDSL
equipment. Since the BBF8 circuit pack does not provide line powering, the far-
end
PairGain
HDSL equipment must be externally powered.
S1:1
BBF8
HDSL
tpa 852341/01
Lucent
FAULT
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