150-419-100-03>
Loopbacks
HRU-419 List 1
September 25, 1998
43
L
OOPBACKS
T
OWARD
THE
N
ETWORK
The HiGain loopbacks toward the network are as follows:
•
Transmit Loss of Signal (TLOS): An HRU logic loopback initiated by a
loss of the T1 input from the CI.
•
Network Remote (NREM): The DSX signal is looped back to the DSX
at the HRU.
•
SmartJack (SMJK): Loopback at the HRU towards the network initiated
by a 2-in 5-in-band loopback code or out-of-band ESF data link code.
•
Network Local Loopback (NLOC): The DSX signal is looped back to the
DSX at the HLU.
•
Network Doubler Loopback 1 (NDU1): Loopback at first doubler
towards network initiated by HLU.
•
Network Doubler Loopback 2 (NDU2): Loopback at second doubler
towards network initiated by HLU.
L
OOPBACKS
T
OWARD
THE
C
USTOMER
The HiGain loopbacks toward the customer are as follows:
•
Customer Remote (CREM): Loopback at HLU (remote) towards
customer initiated from CPE (customer) by intelligent office repeater
code.
•
Customer Local (CLOC): Signal from CI is looped-back to CI at HRU.
•
Customer Doubler 1 Loopback (CDU1): Loopback at first doubler
towards CI initiated by HLU.
•
Customer Doubler 2 Loopback (CDU2): Loopback at second doubler
towards CI initiated by HLU.
