ADC HiGain HLU-200 List 2D User Manual page 43

150-200-124-02, Issue 2
Using the codes listed in
A customer tester can activate loopbacks CLOC or CREM.
Table 10. 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
(c)
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.
Information found in bold in
Repeater Loopback Commands," on page 34
HLU-200 List 2D
Table 10, a network tester can activate loopbacks NLOC or NREM or SMJK (if enabled).
Description
Arming code
Arming code
Disarming code
Disarming code
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
Table 10
February 10, 1999
Code
11000 11000 ...
1111(F)
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)
and Table 11, "Addressable 3 and 4 (A3LB and A4LB)
is specific to HiGain doublers.
GNLB Loopback Test Procedures
(a)
(b)
1111(F)0100(4)1000(8)
-3
Bit Error Ratio
33