Provisioning
150-319-151-01, Revision 01
26
September 17, 1999
HLU-319 List 5A
HLU-319 List 5A. These HiGain units are the only ones that have sufficiently low power consumption to
allow their doubler circuits to be line-powered from -140 Vdc. The HRU-411 must have the CPE power
option disabled if it is used in a -140 Vdc doubler circuit.
•
AUTO
is the conventional mode in which the HLU automatically maintains the HDSL line voltage at
-140 Vdc maximum for non-doubler applications and
±
112 Vdc for doubler applications.
•
HIGH
forces the HDSL line voltage to its high ±112 Vdc level for applications. It is needed to allow the HLU
to power circuits that are providing power to remote Personal Communication Systems (PCS) sites.
Loopback Mode Screen
The Loopback Menu permits you to issue loopbacks to the HiGain system. Depending upon the number of
doublers, there can be up to five loopback screens.
Press
from the Maintenance Terminal Main Menu to display the Loopback Menu.
shows an example
of a Loopback Menu when no doublers are present;
shows an example when four doublers are present.
The following options are available:
•
Type
to select the Disable Loopbacks option.
•
Type
to select HLU Network Loop.
•
Type
to select HRU Network Loop.
•
Type
to select HLU Customer Loop.
•
Type
to select HRU Customer Loop.
•
For doubler applications, additional loopback selections appear on the screen.
•
Type
to exit and return to the previous menu.
lists the HLU-319 Loopback field messages and descriptions.
If the HLU-319 is used with the HRU-411 to power PCS sites, the PWRF option should be set to
AUTO. This causes the HLU to automatically detect the need to switch to the HIGH power feed
mode when it receives a request from the HRU to do so.
Table 9.
Loopback Field Messages and Descriptions
Messages
Full Name
Description
NREM
Network Remote Loopback
Loopback at HRU (remote) towards network.
NLOC
Network Local Loopback
Loopback at HLU (local) towards network.
CLOC
Customer Local Loopback
Loopback at HRU (local) towards CI.
CREM
Customer Remote Loopback
Loopback at HLU (remote) towards CI.
NDU
n
Network Doubler
n
Loopback
Loopback at
n
th
doubler towards network.
CDU
n
Customer Doubler
n
Loopback
Loopback at
n
th
doubler towards CI.
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