Loopbacks - ADC HiGain HLU-200 User Manual

350-200-115-02, Issue 2
L
OOPBACKS
The HLU-200 loopback messages are described in
Message Full Name
SMJK Smart-Jack Loopback
NREM Network Remote
Loopback
NLOC Network Local
Loopback
NDUn Network Doubler n
Loopback
CLOC Customer Local
Loopback
CREM Customer Remote
Loopback
CDUn Customer Doubler n
Loopback
ARM Armed
TLOS Transmit Loss of
Signal (Loopback)
Figure 3 on page 16
loopbacks with doublers.
HLU-200 List 1E
Table 5. Loopbacks
Description
Loopback at HRU toward the HLU initiated by
either the (2 in 5) in-band loopback code or the
out-of-band ESF data link code.
Loopback at HRU toward the HLU initiated by
upstream in-band codes or from the maintenance
terminal.
Loopback at HLU toward the network initiated by
upstream in-band codes or from the maintenance
terminal.
Loopback at Doubler #n to network initiated by
IOR code or by Manual Loopback buttons on the
HLU-200 List 1E front panel or by the
maintenance terminal.
Loopback at HRU toward customer initiated from
Customer Premises Equipment (CPE) by in-band
codes or from the maintenance terminal.
Loopback at HLU toward customer initiated from
CPE by in-band codes or from the maintenance
terminal.
Loopback at Doubler #n to CI initiated by ILR
code, the Manual Loopback buttons on HLU-200
List 1E front panel or by the maintenance
terminal.
The HiGain system detected the Intelligent
Repeater loopback (2 in 5) arming code.
HRU is in a logic loopback state caused by a loss
of its T1 input from the customer, if enabled at
the HRU through its TLOS switch option.
shows the configurations for the HLU-200 List 1E FT1
September 25, 1998
Table 5.
Alarms
15