Alarm Connections; Figure 4. 220 Htu-C Span Powering Diagram - ADTRAN 220 HTU-C Installation And Maintenance Practice

The 220 HTU-C is capable of span powering the HTU-R by applying simplex current to the
local loop. From 0 to 125 mA of current is coupled onto the HDSL span to power the HTU-R
and HRE when deployed. The span powering voltage is –190 volts with Loop 1 providing the
negative voltage and Loop 2 the return, as shown in
2B1Q
HDSL

Alarm Connections

The following alarm signal is connected to the E220 RP Shelf HFAC:
• Pin 32
• Label Fuse Alarm
• Function Loss of signal and fuse alarm of –48 V supply
Alarm processing is actually performed by the E220 RP Shelf HFAC. Refer to the E220 RP
Shelf HFAC documentation for further information.
Alarm conditions are not reported at the 220 HTU-C until the HDSL circuit is terminated by
connecting an HTU-R. This allows circuit pack pre-provisioning. Once the 220 HTU-C is
terminated with an HTU-R, the 220 HTU-C will go into an in-service state.
61247001L1-5A
SPAN POWER
REGULATOR

Figure 4. 220 HTU-C Span Powering Diagram

Figure 4.
LOOP 1
SPAN CURRENT
LOOP 2
Connections
T (26)
R (27)
T (34)
R (35)
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