363-206-305
Circuit Pack Descriptions
7-28
Issue 3 June 2000
DS1PM Quick Reference Summary
7
Transmit Functions
7
Major transmit functions of the DS1PM circuit pack are as follows:
a. Receives four AMI or B8ZS encoded DS1 signals from a DSX-1
b. Recovers DS1 clock and NRZ data from each DS1 signal
c. Synchronizes and maps each data signal to a VT1.5 synchronous payload
envelope (SPE)
d. Inserts VT path overhead
e. Multiplexes four VT1.5 SPEs to a byte-interleaved VT-G signal
f. Provides the VT-G signal to an OLIU circuit pack.
Receive Functions
7
Major receive functions of the DS1PM circuit pack are as follows:
a. Receives a SONET VT-G clock and frame synchronizing signals from its
associated OLIU
b. Demultiplexes the VT-G into four VT1.5 signals
c. Terminates VT path and the embedded DS1 signal from each VT1.5 SPE
d. Desynchronizes the DS1 signals
e. Encodes each DS1 signal into either AMI or B8ZS format
f. Preequalizes (with line build out) each DS1 and provides them to a DSX-1
as bipolar signals.
Control Functions
7
The major control functions of the DS1PM circuit pack are as follows:
a. Protection switching for OLIU circuit pack protection
b. VT path overhead processing
c. Internal fault detection
d. Inventory information (
CLEI
code, date of manufacture, etc.)
e. 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:
a. Monitors DS1 signal for near-end and far-end performance
b. Detects VT path AIS
c. Inserts DS1 AIS toward fiber and toward DSX-1
d. Inserts and detects VT path yellow signal.
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