Table 1. Hdsl List Versions - ADTRAN HTU-C NB Installation And Maintenance Practice

Using narrowband/wideband for litespan

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The HTU-C NB/WB for Litespan can be used in Litespan 2000, Litespan 2012, and Litespan

ONU channel bank assembly (CBA) systems containing Litespan system software versions of

7.1.3 or higher. Each HTU-C works with the following multiple list versions of the HDSL unit

remote end (HTU-R), and HDSL Range Extender (HRE):

Part Number

1247024Lx

1247026Lx

1247041Lx

1247045Lx

1246026Lx

1246041Lx

1246045Lx

1245024L1

x = any generic number

The HTU-C NB/WB for Litespan can be deployed in circuits consisting of one HTU-C and one

HTU-R. When deployment requires the HRE, which doubles the service range, the HTU-C NB/

WB for Litespan can be deployed with one Low Voltage HRE and one Low Voltage HTU-R.

The HDSL local loop operates as two independent subsystems, each operating over a single

twisted pair. The HTU-C NB/WB for Litespan communicates over these two twisted pairs to

the HTU-R. Each subsystem carries half of the total bandwidth along with a small amount of

overhead used for maintenance and performance monitoring.

Lightning and power cross-protection is provided at each twisted pair interface of the ADTRAN

HTU-C NB/WB for Litespan line card. Local power bus fusing is also used to protect the

Litespan channel bank backplane, Litespan bank power supplies, and neighboring Litespan

line cards in the event of catastrophic line card failure.

The HTU-C NB/WB for Litespan uses a DC-to-DC converter to derive span powering voltage

from the Litespan –48 VDC switched battery supply. The HTU-C NB/WB for Litespan can

span power HREs and HTU-Rs as listed above.

Simplex current of 30 to 155 mA of current may be coupled onto the HDSL loop span to power

the HTU-R and HRE when deployed (see

ments of Class A2 voltages as specified by Bellcore GR-1089-CORE.

61247002L1-5A