Set Factory Default Values; Product Identification - PairGain HiGain HLU-319 Manual

Revision 01

Set Factory Default Values

To set all options to the factory default values:
1 Press the SEL button for six seconds. The DFLT NO message appears.
2 Do one of the following:
•
To set the default values, press the SEL button while the DFLT NO
message displays. DFLT YES displays, indicating the factory
default values are now in effect.
•
To terminate the Default mode, without setting the factory default
values, press the MODE button or do nothing for 30 seconds.

Product Identification

Pressing the MODE button for three or more seconds causes the display to
scroll through the HLU-319 List 4B software version number, its list number,
the type of frame pattern being received from the DSX-1, the line code setting
of the HLU-319 List 4B, and all options settings. The line code parameter is
the actual DSX-1 line code being received by the HLU-319 List 4B when
Framing is set to AUTO (on the System Settings menu). When the framing
parameter is not set to AUTO, the HLU-319 LIST 4B mimics one of the other
line code settings, AMI or B8ZS. This is not determined by the received line
code.
The DS1 line code option should be set to conform to the type of T1 service
(AMI or B8ZS) being provided by the HiGain system. The AUTO mode,
which can adapt to either AMI or B8ZS, should be used in applications that
require it, such as when the HLU-319 List 4B acts as a standby circuit to T1
circuits whose line codes are not known or may be both AMI and B8ZS.
Before selecting AUTO, consider the following limitations:
1 AUTO induces one BPV in the T1 bit stream whenever it switches from
AMI to B8ZS.
2 AUTO allows each HiGain system end to set its DS1 mode to the code it
is receiving at its local T1 input port. This makes each unit's code
independent of the T1 code being sent from a distant T1 input port. Thus,
if the line codes received by the HiGain system are different at each end
of the two T1 directions, the HiGain T1 output codes will not match,
causing the received data to be AMI instead of B8ZS (or vice versa), and
thus violating the 1s density rules by having excessive zeroes.
22
December 22, 1997
PairGain Engineering - Plant Series
150-319-142-01
HLU-319 List 4B