A3Lb And A4Lb Test Procedures; Table 14. Addressable 1, 2, 5 (A1Lb, A2Lb, A5Lb) Repeater Loopback Commands - PairGain HLU-231 Manual
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Loopback Operation
Table 14. Addressable 1, 2, 5 (A1LB, A2LB, A5LB) Repeater Loopback Commands
Name
ARMING or NI LPBK (in-band)
ARMING or NI LPBK (ESF Data Link)
IR LPDN or DISARM (in-band)
DISARM (ESF Data Link)
IOR LPBK (NLOC and CREM 229-231 bit errors)
ILR-1 LPBK (NDU1 and CDU1 10 bit errors)
LR-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
e
FAR END NI ACTIVATE
IOR POWER DOWN (HLU)
a The left most bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
(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.
b This is the HEX number for the 4-bit group.
c The HRU identifies CREM with 231 bit errors, including the frame bits. When framed data is being sent in the AUTO framing
mode, the number of the 231 bit errors detected by the test set varies from 229 to 231, depending on whether or not the test
set counts frame errors as bit errors, and on the number of frame bits contained in the block of 231 error bits.
d The HRU generates this bit pattern in a series of discontinuous bursts containing 20-bit errors each, including frame bits.
Those test sets that do not count frame error bits as data bit errors will indicate fewer bits than the HRU transmits for this CI
loopback.
e Not supported by A5LB.
A3LB and A4LB Test Procedures
The HLU-231 can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code
1111(F) 1111(F) 0001(1) 1110(E) for at least 5 seconds. This causes the HLU-231 to enter the NLOC state. The
Loopback Time-out option can be set by the user to:
•
NONE (0 minutes)
•
20 minutes
•
60 minutes
•
120 minutes
These selections determine 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-231 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.
44
Description
Arming code
Arming code
Disarming code
Disarming code
c
HLU Loopup
d
DOUBLER-1 Loop up
DOUBLER-2 Loop up
HRU Loop up
Loopdown (HLU or HRU)
Query loopback
Alternate Query loopback
Loopback Time-out Override
Unblock AIS and pass 2-in-5
Removes HDSL line power
September 23, 1998
150-231-175-01, Revision 01
a
Code
11000 11000 ...
b
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(C)0111(7)0100(4)0001(1)
1100(C)0111(7)0101(5)0100(4)
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)
-3
Bit Error Ratio
HLU-231 List 7E
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