Appendix A: Additional Technical Information
150-402-102-01, Revision 01
50
July 27, 1998
HRU-402 List 2
The following line units automatically turn off their line power supply when
they are connected to a locally powered HRU-402 List 2:
•
List 6 and higher versions of the HLU-231
•
All versions of the HLU-319 and HLU-388
Refer to the appropriate HLU technical practice if you need more information
about its local and line powering capabilities.
If local power is lost to an HRU-402 List 2, the last span loses sync. When the
HLU or HDU attempts to reestablish sync, it detects that the remote unit is
not locally powered and applies line power to it. The remote unit then powers
up and operates normally if it is within range to support line powering.
The -48V local power supply must have 110 mA output current capacity
(5.2W) to power each HRU-402 List 2.
A Teltrend© WPS-2005 Wall-Mount Power Supply (-48V and 250 mA) is
capable of powering two HRU-402 List 2 units. The 2005 provides spade lugs
to access its -48V output.
You can reach Teltrend at: 1 (800) TEL-TREN.
Simplex Sealing Current Information
When locally powered, the HRU-402 List 2 can source from 30 mA (short
loop) to 20 mA (long loop) of simplex sealing current towards the upstream
unit over the two HDSL pairs. The SCURR (S1) switch, located on the
printed circuit board at the back of the unit, allows this sealing current to be
enabled (ON) or DIS (OFF). See
for further
information.
The HRU-402 List 2 supports four-span line powering and
five-span local powering applications.
