ADC HiGain HLU-200 User Manual page 38

Table 13. HLU-200 A2LB Test Procedures (Continued)
Step
5 Using the following codes, a network tester can activate loopbacks NLOC or NREM or SMJK if enabled
(shown in Figure 7 for non-doubler loopback configurations and Figure 16 for doubler loopback
configurations.) A tester at the CI can activate loopbacks CLOC or CREM.
ADDRESSABLE 2 (A2LB) REPEATER LOOPBACK COMMANDS
ARMING or NI LPBK (inband )
ARMING or NI LPBK (ESF Data
Link)
IR LPDN or DISARM (inband )
DISARM (ESF Data Link)
IOR LPBK
(NLOC and CREM 231 errors)
ILR-1 LPBK
(NDU1 and CDU1 10 bit errors)
ILR-20 LPBK
(NDU2 and CDU2 200 bit errors)
ILR-2 LPBK
(NREM and CLOC 20 bit errors)
IR LPDN
IR QUERY LPBK
IR ALTERNATE QUERY LPBK
TIME-OUT OVERRIDE
FAR END NI ACTIVATE
IOR POWER DOWN (HLU)
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. The IOR POWER DOWN code must remain present
for the duration of the power down mode. When this code is removed, the HiGain system returns to its
normal unlooped and unarmed state. 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.
6 After testing is complete, send the universal loopdown [IR (Intelligent Repeater) LPDN] code if the system
is to loopdown but remain ARMED. Send the disarm code 11100 if all the equipment is to be looped
down, disarmed and returned to normal operation. Note that the ARMED mode has an automatic time-out
of 120 minutes.
7
Note: Doubler specific information is shown in italics.
36
Action
Arming code
Arming code
Disarming code
Disarming code
HLU Loop up
Doubler 1
Loop-up
Doubler 2
Loop-up
HRU Loop up
Loop down
(HLU or HRU)
Query loopback
Alternate Query loopback
Loopback Time- out
Override
Unblock AIS and pass 2 in 5
Removes HDSL line power
November 22, 1996
150-200-114-03, Issue 03
11000 11000 ...
1111(F)*1111(F)0100(4)1000(8)
11100 11100 ...
1111(F)1111(F)0010(2)0100(4)
1101(D)0011(3)1101(D)0011(3)
1100 0111 0100 0001 (C741)
1100 0111 0101 0100 (C754)
1100(C)0111(7)0100(4)0010(2)
1001(9)0011(3)1001(9)0011(3)
1101(D)0101(5)1101(D)0101(5)
1101(D)0101(5)1110(E)1010(A)
1101(D)0101(5)1101(D)0110(6)
1100(C)0101(5)0101(5)0100(4)
0110(6)0111(7)0110(6)0111(7)
HLU-200 List 1D