ADC HiGain HLU-200 User Manual page 40

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, List 6D down is to issue one of the three loop-down
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 system loopbacks shown in
Figure 7 and Figure 8. Note that all code sequences must be present for at least five seconds.
ADDRESSABLE 4 (A4LB) 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 (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.
38
Table 15. HLU-200 A4LB Test Procedures
Action
ABBREVIATIONS USED BELOW:
LU = LoopUp
LD = LoopDown
NI = Network Interface
CI = Customer Interface
ESF-DL = Extended Super Frame Data Link
Loop Down
Loop Down
Loop Down
November 22, 1996
Name
NLOC 1111(F)*1111(F)0001(1)1110(E)
CREM 0011(3)1111(F)0001(1)1110(E)
NDU1 1111 1111 0000 0100 (FF04)
CDU1 0011 1111 0000 0100 (3F04)
NDU2 1111 1111 0000 0110 (FF06)
CDU2 0011 1111 0000 0110 (3F06)
NREM 1111(F)1111(F)0000(0)0010(2)
CLOC 0011(3)1111(F)0000(0)0010(2)
SMJK 11000 11000 11000 ...
SMJK 1111(F)1111(F)0100(4)1000(8)
11100 11100 11100 ...
100 100 100 ...
1111(F)1111(F)0010(2)0100(4)
150-200-114-03, Issue 03
Code
HLU-200 List 1D