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T
H2TU-C-388 L
HE
The H2TU-C-388 List 4G line unit is the Central Office (CO) side of a T1
transmission system. The H2TU-C, when used with an H2TU-R remote unit, transmits
a 1.544 Mbps payload on one unconditioned copper pair over the full Carrier Service
Area (CSA) range. The H2TU-C-388 List 4G is designed to mount in Double Dual
Module Plus (DDM+) high-density mechanics shelves.
F
EATURES
Front-panel features: craft port for maintenance
screen access, six LEDs for system status
reporting, and DSX-1 access jacks
HDSL2 transmission features:
• Full-duplex transmission on one copper pair
• Grounded loop detection on HDSL2 span
• Souces sealing current
• Fractional T1 mode selection
Maintenance screens for inventory, provisioning,
performance monitoring, and troubleshooting,
including:
• Remote provisioning and PM data retrieval
through TL1 FDL commands
S
PECIFICATIONS
Operating Temperature
Operating Humidity
HDSL2 Span Voltage
CO Supply
Mounting
HDSL2 Line Rate
HDSL2 Output
Maximum Insertion Loss
Maximum Loop Attenuation 28 dB
DSX-1 Line Rate
DSX-1 Line Format
DSX-1 Frame Format
DSX-1 Pulse Output
DSX-1 Input Level
4G
IST
-40°F to +149°F (-40°C to +65°C)
5% to 95% non-condensing
0 or -180 Vdc ±5 Vdc
-48 Vdc nominal (-42.5 Vdc to -56.5 Vdc)
DDM+ high-density shelf
1.552 Mbps Overlapped Pulse Amplitude Modulation Transmission
with Interlocking Spectra (OPTIS)
+16.8 dBm ±0.5 dBm, 135Ω at CO side
+16.5 dBm ±0.5 dBm, 135Ω at remote side
35 dB @ 196 kHz
1.544 Mbps ±200 bps
Alternate Mark Inversion (AMI) or Bipolar with 8-Zero Substitution (B8ZS)
Extended SuperFrame (ESF), SuperFrame (SF), or Unframed (UNFR)
pk-pk
6 V
, pre-equalized for 0 to 655 feet of ABAM cable
+1.5 dB to -7.5 dB DSX
• Loop attenuation and insertion loss reporting
• Power Back Off (PBON and PBOC) for
configuring HDSL2 transmit power levels to
reduce crosstalk
• Report menu option for downloading status and
performance data
• Non-volatile storage of performance monitoring
parameters
• Customer disconnect indication alarms (AIS-CI
and RAI-CI alarm patterns)
• Performance Report Messaging (SPRM,
NPRM, and S + N)
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