Isdn - ADTRAN Total Access 3000 System Manual

6TASYS101-1E
TOTAL ACCESS 3000/3010
SYS-101
Page 39 of 46
Communication between the HTU-C, HRE, and HTU-R is maintained over two-pair
twisted cable in an existing CSA loop. In HDSL2, communication is maintained over a
single twisted pair in an existing CSA loop. The HRE and H2R can maintain all loop
monitoring and pass Operations, Administration, Maintenance, and Provisioning
information (OAM&P) through to the HTU-C and H2TU-C, respectively.
The elimination of unnecessary repeaters greatly reduces the problems associated with
repeater performance due to moisture and temperature extremes. With less equipment
involved, maintenance of a T1 circuit is limited to the equipment at the DSX-1 shelf
and the customer's premises, which are easily tested. This aspect of provisioning
reduces the overhead costs required to manage the hardware deployed in a T1 link.
Because HDSL/HDSL2 requires less equipment, fewer cable intrusions, reduced
engineering, and will run on practically any available cable pairs, circuit turn-up time
can be reduced from weeks to a matter of a few hours, or at most a few days. Often the
only testing required is a simple loop qualification test that can be executed from the
Central Office.
Two HREs are the maximum that can be deployed in an HDSL circuit. This
configuration will extend the range of the circuit to 36,000 feet (6.82 miles). HDSL2
technology is limited to a single H2R, extending the HDSL2 range to 24 kft.
5.2.2

ISDN

Total Access 3000/3010 allows you to take maximum advantage of the carrying
capacity on copper pairs while minimizing the number of pairs required. 140/110
ISDN Basic Rate Interfaces (BRIs) can be deployed from a single shelf.
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Total Access 3000/3010 System Manual © 2003, ADTRAN, Inc.