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HLU-388 L
®
The HiGain
repeaterless, T1 transmission system. When used in conjunction with a HiGain
Remote Unit (HRU), the system provides 1.544 Mbps transmission on two
unconditioned copper pairs over the full Carrier Service Area (CSA) range. The CSA
includes loops up to 12,000 feet of 24 (American Wire Gauge) AWG or 9,000 feet of
26 AWG wire, including bridged taps. This line unit can be used in applications with
or without HiGain Doubler Units (HDUs).
F
EATURES
• Front panel status LED, four-character status
display
• Ultra low wander
• Five-span range with four doublers
(60 kft, 24 AWG)
• Selectable power feed modes
• Loss of Signal (LOS)/Alarm Indicator Signal
(AIS) payload alarm option
• Additional screens for inventory and
troubleshooting
S
PECIFICATIONS
Operating Temperature
Operating Humidity
HDSL Span Voltage
Mounting
HDSL Line Code
HDSL Output
Maximum Provisioning Loss
DS1 Line Rate
DS1 Line Format
DS1 Frame Format
DSX-1 Pulse Output
DSX-1 Input Level
5D
IST
Line Unit HLU-388 List 5D is the Central Office (CO) side of a
• Payload (PL) or HiGain Generic (HG) loopback
source identification
• Reduced power consumption
• Low line-power option (-140 Vdc) for circuits
with a single doubler
• Bit Error Rate (BER) alarm options
• Bipolar Violation Transparency (BPVT)
options
• Grounded loop detection
-40 °F to 149 °F (-40 °C to + 65°C)
5% to 95% non-condensing
-140 or ±112 Vdc
DDM+ high-density shelf
784 kbps 2B1Q
+13.5 dBm ±0.5 dB, 135 Ω
35 dB at 196 kHz, 135 Ω
1.544 Mbps ±200 bps
Alternate Mark Inversion (AMI) or Bipolar with
8-Zero Substitution (B8ZS)
Extended SuperFrame (ESF), SuperFrame (SF),
or THRU
pk-pk
6 V
, pre-equalized for 0 to 655 feet of ABAM
cable
+1.5 to -7.5 dB DSX
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