363-206-285
Technical Specifications
Issue 3 June 2001
10-11
HDSL Interface (BBF8) 10
■ Electrical Specification
The High bit rate Digital Subscriber Line (HDSL) circuit pack transmits and
receives a 2B1Q signal as specified in Telcordia Technologies
TA-NWT-001210.
— Data is scrambled/descrambled with a pseudo-random sequence
— Line buildout is automatically provisioned
— Compensated for data inversion caused by tip-ring reversals
■ Format Specification
The HDSL allows for clear channel transport of a framed or unframed DS1.
Its data stream consists of two 784 Kb/s signals transported on separate
wire pairs. Together, the aggregate bi-directional bit rate is 1.544 Mb/s. The
remaining 24 Kb/s is used for training and diagnostic information.
— Compatible with PairGain
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equipment
■ Alarm reporting
— LOS
A LOS is reported if either HDSL line experiences a synchronization failure
■ Loopback
DS1 terminal loopback for each HDSL interface
■ Performance Monitoring (PM) — Available through the HDSL link
management port only.
— User-configurable alarm thresholds
— 15-minute, 24-hour, and 7-day performance histories
— Asynchronous serial interface for provisioning and PM
■ Management
— SONET Management
This link is accessible via the SONET DCC and DDM-2000 CIT. It allows
the HDSL circuit pack to be provisioned for DS1 facility loopbacks.
— HDSL Link Management
This link is accessible via a faceplate mounted RS-232 interface. It allows
management of each HDSL port only (management of the DDM-2000 is
not accessible through this interface). This management port supports a
menu driven interface for each HDSL port; managed features include:
— PM features listed above
— Local and remote loopbacks
— Programmable loopback time-out
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