A2Lb Test Procedures; Addressable Repeater Loopback Commands (A2Lb) - ADC PAIRGAIN HiGain HDSL2 Manual

Testing

A2LB Test Procedures

Using the codes listed in
enabled). A tester at the customer premises can activate CLOC, CRG, or CREM loopbacks. All loopbacks shown
in Table 22 can also be initiated from the H2TU-C front-panel MODE and SEL buttons (see
through MODE and SEL" on page
Name
ARMING or NI LPBK (inband)
ARMING or NI LPBK (ESF Datalink)
IR LPDN or DISARM (inband)
IR LPDN or DISARM (ESF Datalink)
IOR LPBK (NLOC and CREM)
230-232 bit errors
(b)
229-231 bit errors
ILR-1 LPBK
(NRG1 and CRG1 10 bit errors)
ILR-20 LPBK
(NRG2 and CRG2 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 (H2TU-C)
(a) The leftmost bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
The entire arming and loopback sequence can also be initiated at the remote H2TU-R location.
(b) The H2TU-R identifies CREM (and the H2TU-C identifies NLOC) 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. The H2TU-R and H2TU-C generate 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 H2TU-R and H2TU-C transmit for a CI and NI loopback.
(c) The IOR Power Down code must remain present for the duration of the powerdown mode. When this code is removed, the
HiGain HDSL2 system returns to its normal unlooped and unarmed state.
54
Table 22, a network tester can activate NLOC, NRG or NREM loopbacks (or SMJK, if
12). Information specific to HiGain HDSL2 regenerators is shown in bold type.
Table 22. Addressable Repeater Loopback Commands (A2LB)
Description
Arming code
Arming code
Disarming code
Disarming code
H2TU-C loopup
Regenerator-1 loopup
(b)
Regenerator-2 loopup
H2TU-R loopup
Loopdown (H2TU-C, H2RU, or
H2TU-R)
Query loopback
Alternate query loopback
Loopback time-out override
Unblock AIS
(c)
Removes HDSL2 line power
Binary Code
11000-11000 ...
1111-1111-0100-1000 (FF48)
11100-11100 ...
1111-1111-0010-0100 (FF24)
1101-0011-1101-0011 (D3D3)
1100-0111-0100-0001 (C741)
1100-0111-0101-0100 (C754)
1100-0111-0100-0010 (C742)
1001-0011-1001-0011 (9393)
1101-0101-1101-0101 (D5D5)
1101-0101-1110-1010 (D5EA)
1101-0101-1101-0110 (D5D6)
1100-0101-0101-0100 (C554)
0110-0111-0110-0111 (6767)
April 21, 2000
152-231-115-03, Revision 03
"Setting Options
(a)
(Hexadecimal Equivalent)
-3
BER on the facility.
H2TU-C-231 List 1E