363-206-305
Circuit Pack Descriptions
Issue 3 June 2000
7-61
HDSL Quick Reference Summary
7
Communication Functions
7
Major transmit (Xmit) and receive (Rcv) functions of the HDSL circuit pack are as
follows:
■
Multiplexes four VT1.5 SPEs to a byte-interleaved VT-G signal (Xmit)
■
Provides the VT-G signal to a 28-type circuit pack (Xmit)
■
Inserts VT path overhead (Xmit)
■
Receives up to two HDSL formatted signals (Xmit)
■
Provides HDSL to VT1.5 mapping (Xmit)
■
Recovers DS1 and NRZ data from each HDSL payload (Xmit)
■
Synchronizes and maps each data signal to a VT1.5 SPE (Xmit)
■
PairGain
compatible, 4-wire HDSL
■
Bi-directional transmission port of 1.544 Mb/s over twisted pair
■
Loopback options
■
Receives SONET VT-G frame synchronizing signals from its associated 28-
type
■
Demultiplexes the VT-G into four VT1.5 signals (Rcv)
■
Terminates VT path and the embedded DS1 signal from each VT1.5 SPE
(Rcv)
■
Desynchronizes the DS1 signals and maps directly into
PairGain
HDSL
(Rcv).
Control Functions
7
The major control functions of the HDSL circuit pack are as follows:
■
Protection switching for 28-type circuit packs
■
VT path overhead processing
■
Internal fault detection
■
Inventory information (
CLEI
code, date of manufacture, etc.).
Maintenance Signal Functions
7
The major maintenance signal functions are as follows:
■
Monitors a DS1 signal with SF or ESF frame format and generates PM data
■
Monitors DS1 signal for near-end and far-end performance
■
Detects VT path AIS
■
Inserts DS1 AIS toward fiber and far-end HDSL equipment
■
Inserts and detects VT path yellow signal.
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