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Circuit Pack Descriptions
7-52 Issue 3 June 2001
HDSL Quick Reference Summary 7
Transmission Functions 7
Major transmission functions of the HDSL circuit pack are as follows:
■ Multiplexes four VT1.5 SPEs to a byte-interleaved VT-G signal
■ Provides the VT-G signal to a MXRVO/STS1E circuit pack
■ Inserts VT path overhead
■
PairGain
compatible, 4-wire HDSL
■ Bi-directional transmission port of 1.544 Mb/s over twisted pair
■ Loopback options
■ Receives up to two HDSL formatted signals
■ Receives a SONET VT-G clock and frame synchronizing signals from its
associated MXRVO/STS1E
■ Demultiplexes the VT-G into four VT1.5 signals
■ Terminates VT path and the embedded DS1 signal from each VT1.5 SPE
■ Desynchronizes the DS1 signals and maps directly into
PairGain
HDSL
■ Provides HDSL to VT1.5 mapping
■ Recovers DS1 clock and NRZ data from each HDSL payload
■ Synchronizes and maps each data signal to a VT1.5 SPE.
Control Functions 7
The major control functions of the HDSL circuit pack are as follows:
■ Protection switching for MXRVO/STS1E circuit packs
■ VT path overhead processing
■ Internal fault detection
■ Inventory information (
CLEI
code, date of manufacture, etc.)
■ Monitors a DS1 signal with SF or ESF frame format and generates PM
data
Maintenance Signal Functions 7
The major maintenance signal functions are as follows:
■ Monitors DS1 signal for near-end and far-end performance
■ Detects VT path AIS
■ Inserts DS1 AIS toward fiber and far-end HDSL equipment
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