ADC HiGain HLU-200 User Manual page 39

150-200-114-03, Issue 03
Step
1 The HiGain Line Unit can be looped back (NLOC in Figure 7 for non-doubler loopback configuration,
NLOC in Figure 8 for doubler loopback configuration) by sending the Addressable Office Repeater (AOR)
LPBK activation code 1111(F) 1111(F) 0001(1) 1110(E) for at least five seconds. This causes the HLU-
200 List 1D to enter its NLOC state. The Loopback Time-out option, which is user settable to NONE, 20,
60 or 120 minutes, determines the duration of this loopback unless it is overridden by the reception of a
second identical 16-bit loop-up command before the timer expires. When this time-out override state
exists, the only way to loop the HLU-200 List 1D down is to issue one of the three loopdown commands
listed in Step 2. The automatic time-out mode is restored during subsequent loopback sessions.
2 The following list summarizes the codes required to execute all the HiGain loopbacks shown in Figure 7
and Figure 8. Note that all code sequences must be present for at least five seconds.
ADDRESSABLE 3 (A3LB) REPEATER LOOPBACK COMMANDS
Position
HLU-200 LU FROM NI
HLU-200 LU FROM CI
HDU-451 DOUBLER 1 from NI
HDU-451 DOUBLER 1 from CI
HDU-451 DOUBLER 2 from NI
HDU-451 DOUBLER 2 from CI
HRU-412 LU FROM NI
HRU-412 LU FROM CI
HRU-412 LU FROM NI
HRU-412 LU FROM NI
HRU-412 LU FROM NI (ESF-DL)
HLU and HRU LD FROM NI OR CI
HLU and HRU LD FROM NI OR CI
HLU and HRU LD FROM NI OR CI
(ESF-DL)
Note: The left most bit arrives first in all sequences. The detection algorithm functions reliably with a
-3
random 10 Bit Error Ratio (BER) on the facility. Note that the entire arming and loopback sequence can
be initiated at the remote HRU location. *This is the HEX number for the 4-bit group.
3
Note: Doubler specific information is shown in italics.
HLU-200 List 1D
Table 14. HLU-200 A3LB Test Procedures
Action
ABBREVIATIONS USED BELOW:
LU = LoopUp
LD = LoopDown
NI = Network Interface
CI = Customer Interface
ESF-DL = Extended Super Frame Data Link
Name
NLOC
CREM
NDU1
CDU1
NDU2
CDU2
NREM
CLOC
SMJK
SMJK
SMJK
Loop Down
Loop Down
Loop Down
November 22, 1996
Code
1111(F)*1111(F)0001(1)1110(E)
0011(3)1111(F)0001(1)1110(E)
1111 1111 0000 0100 (FF04)
0011 1111 0000 0100 (3F04)
1111 1111 0000 0110 (FF06)
0011 1111 0000 0110 (3F06)
1111(F)1111(F)0000(0)0010(2)
0011(3)1111(F)0000(0)0010(2)
11000 11000 11000 ...
100000 100000 100000 ...
1111(F)1111(F)0100(4)1000(8)
11100 11100 11100 ...
100 100 100 ...
1111(F)1111(F)0010(2)0100(4)
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