ADC H2TU-C-388 - Manual (Page 48)

Testing 152-388-100-02, Issue 2
40 June 6, 2000 H2TU-C-388 List 1
Table 15. Summary of HiGain Loopback Codes and Activation Methods
Method of Activation
Loopback Code Description Test Set Craft Port MODE/SEL
NLOC 1111000
4-in-7
DSX-1 signal is looped back to the network at the H2TU-C. X X X
NREM 1110000
3-in-7
DSX-1 signal is looped back to the network at the H2TU-R. X X X
CLOC 1111100
5-in-7
Signal from the customer is looped back to the customer
at the H2TU-R. X X X
CREM 1111110
6-in-7
Signal from the customer is looped back to the customer
at the H2TU-C. X X X
COLB Dual loopback at the H2TU-C. DSX-1 signal is looped back
to the network at the H2TU-C and signal from the customer
is looped back to the customer at the H2TU-C.
X X
RULB Dual loopback at the H2TU-R. DSX-1 signal is looped back
to the network at the H2TU-R and signal from the customer
is looped back to the customer at the H2TU-R.
X X
SMJK LpUp
(PL)
11000
2-in-5
SmartJack Loopup or NID payload (PL) code. Invokes
H2TU-R loopback towards network. X
SMJK LpUp
(ESF-DL)
1111-1111-
0100-1000 SmartJack Loopup or NID (ESF-DL) code. Invokes
H2TU-R loopback towards network. X
SMJK LpDn
(PL)
11100
3-in-5
SmartJack Loopdown or NID payload (PL) code. Removes
SMJK, NLOC, NREM, CLOC, CREM, CRGx, and NRGx. X
SMJK LpDn
(ESF-DL)
1111-1111-
0010-0100 SmartJack Loopdown or NID (ESF-DL) code. Removes
SMJK, NLOC, NREM, CLOC, CREM, CRGx, and NRGx. X
HiGain systems feature the SmartJack option which can emulate a Network Interface Device
(NID) for the purpose of loopback testing of the HiGain circuit. SMJK and NREM loopbacks
perform the same functions, but their initiation differs. SMJK indicates that the loopback was
initiated by the 2-in-5 inband command. NREM, on the other hand, is initiated by the 3-in-7
inband command or by a command issued from the maintenance terminal or the MODE and SEL
buttons.
Use the inband commands to enable or disable the SMJK loopback options. The H2TU-C-388
system setting is normally enabled to recognize all inband SmartJack loopback commands.