PairGain 150-1111-75, Руководство пользователя

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Overview 150-231-175-01, Revision 01
2 September 23, 1998 HLU-231 List 7E
A
PPLICATIONS
The HiGain system provides a cost-effective, easy to deploy method for delivering T1 High Capacity Digital
Service (HCDS) over metallic pairs:
•
The service is deployed over two unconditioned, non-loaded copper pairs, yet it demonstrates a quality that
is competitive with fiber optics.
•
Conventional in-line T1 repeaters are not required.
•
Cable pair conditioning, pair separation and bridged tap removal, are not required.
Each loop has no more than 35 dB of loss at 196 kHz, with driving and terminating impedances of 135
Ω
. Table 1
provides a “loss” guide for the various cable gauges at 196 kHz and 135
Ω
. The table applies to the HDSL cable
pairs between the HLU, HRU, and HDU modules. In the absence of specific insertion loss measurement data, add
3 dB for each bridged tap and 1 dB for each cable gauge change.
The HiGain system operates with any number of other T1, POTS, Digital Data Service (DDS) or other HiGain
systems sharing the same cable binder group. HiGain systems can be used with customers requiring DS1 service
on a temporary or permanent basis. The HiGain system also provides a means of quickly deploying service in
advance of fiber-optic transmission systems. With the HiGain system, service can be provided within hours. Fiber
optic systems can be installed at a leisurely pace and cut-over from the installed HiGain system when convenient
to do so. The installed HiGain system can then be easily removed and utilized elsewhere.
In general, HiGain systems:
• operate with any number of other T1, POTS, Digital Data Service (DDS) or other HiGain systems sharing the
same cable binder group
• can be used with customers requiring DS1 service on a temporary or permanent basis
• provide a means of quickly deploying service in advance of fiber-optic transmission systems.
With a HiGain system, service can be provided within hours. Fiber-optic systems can be installed incrementally
and cut-over from the installed HiGain system when convenient to do so.
Applications without HiGain Doublers
This section addresses HLU-231 List 7E operation when used without doublers. For applications without
doublers, the HLU-231 is directly connected to the HRU by the two HDSL cable pairs. The HLU-231 is
compatible with all HiGain HRUs.
Table 1. HDSL Loss Over Cables
Cable Gauge Loss at 196 kHz (db/kft) Ohms per kft
26/0.4mm 3.88 83
24/0.51mm 2.84 52
22/0.61mm 2.18 32
19/0.91mm 1.54 16