150-451-142-04, Revision 04
Product Overview
HDU-451 List 4B
October 8, 1998
1
P
RODUCT
O
VERVIEW
PairGain’s HiGain Model HDU-451 List 4B low power Doubler Unit
(
) extends the range of the HiGain repeaterless T1
transmission system. When installed between a HiGain Line Unit with
doubler-powering capability, and an HRU-412 HiGain Remote Unit, the
HDU-451 enables 1.544 Mbps transmission over an extended Carrier Serving
Area (CSA) range of approximately 24,000 feet of 24 AWG or 18,000 feet of
26 AWG wire. Customers can use two doublers in series to triple the normal
CSA range (36,000 feet on 24 AWG).
The HDU-451 mounts in a single slot of any industry standard 400 mechanics
shelf or in equivalent enclosures manufactured by PairGain Technologies. All
HiGain modules comply with the applicable requirements of
TR-TSY-000063 (Network Equipment Building System (NEBS) Generic
Equipment requirements) and TR-TSY-000499 (Transport System Generic
Requirements - TSGR).
D
ESCRIPTION
AND
F
EATURES
HDU-451 List 4B, HiGain Doubler Unit features:
•
Powered by the HLU List 6D - no local power required
•
Front Panel HDSL Status Display
•
Front panel jacks for test access
•
Lightning and power cross protection on the HDSL interfaces (both
sides)
•
Front Panel Doubler loopback LED indicator
•
Low power dissipation
The HDU-451 List 4B unit is compatible with any HiGain Line Unit that
supports doublers.
The HDU-451 List 4B is identical to the List 3B, except that it is compatible
with both metallic sealing currents and the simplexed sealing currents that are
found in HiGain remote units.
