HDSL T200 HTU-R, Span Powered, 60 mA Installation and Maintenance Practice
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61247026L1-5A
Description
The T200 HTU-R, SP/60 mA is a network terminating unit used to deploy an HDSL T1 circuit
using 4-wire metallic facilities. The T200 HTU-R, SP/60 mA is a T200 mechanics card which will
fit T200 mechanics enclosures.
This version of the T200 HTU-R, SP/60 mA works with multiple list versions of the HDSL
transceiver unit for the central office (HTU-C), and HDSL Range Extenders (HREs) as listed
below.
The T200 HTU-R, SP/60 mA can be deployed in circuits using one HTU-C and one HTU-R.
The T200 HTU-R, SP/60 mA can also be deployed with one HTU-C and one HRE in circuits
requiring reach beyond standard CSA requirements. The T200 HTU-R, SP/60 mA will power
an external T1 NIU using a 60 mA constant current source. The T200 HTU-R, SP/60 mA
terminates local loop HDSL signals originating from the Central Office (CO) unit and trans-
forms the HDSL signal into traditional DS1 signals to be delivered to the customer.
The HDSL local loop operates as two independent subsystems each operating over a single
twisted pair. The T200 HTU-R, SP/60 mA communicates over these two twisted pairs to the
HTU-C located at the CO. Each subsystem carries half of the total bandwidth along with a
small amount of overhead used for maintenance and performance monitoring related
functions.
The effective range of an ADTRAN HDSL-based T1 circuit can be extended using the ADTRAN
HDSL Range Extender (HRE). The HRE can double the deployment range of standard HDSL
and extend the digital subscriber loop serving range up to 36 kft on 24-gauge twisted pair wire
using two HREs.
The T200 HTU-R, SP/60 mA can be used with any HRE and any HTU-C to provide a fully span-
powered extended range HDSL circuit. Span power is provided from the HTU-C. Span
powering meets all requirements of Class A2 voltages as specified by Bellcore GR-1089-CORE.
Table 1. HDSL Compatibility
Part Number
Description
1245006L6
5th Gen T200 HTU-C
124600xLx
6th Gen HTU-C
1246041L1
6th Gen T200 HRE
1246045L1
6th Gen 239 HRE
1247002Lx
7th Gen Litespan HTU-C
1247001Lx
7th Gen 220 HTU-C
1247003Lx
7th Gen DDM+ HTU-C
1247004Lx
7th Gen 3192 HTU-C
1247045Lx
7th Gen 239 HRE
1247041Lx
7th Gen T200 HRE
x = any number
