363-206-305
Technical Specifications
Issue 3 June 2000
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 78 Kb/s signals transported on separate
wire pairs. Together, the aggregate bi-directional bit rate is 1.554 MB/s. The
remaining 24 Kb/s is used for training and diagnostic information.
— Compatible with
PairGain
*
equipment.
■
Alarm reporting
—LOS.
An LOS is reported if either HDSL line experiences a synchronization
failure.
■
Loopback
DS1 facility 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:
*
PairGain
is a registered trademark of PairGain Technologies, Inc.
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