A2Lb Test Procedures - ADC HiGain H2TU-C-388 List 1E User Manual

Testing

A2LB Test Procedures

Using the codes listed in
enabled). A tester at the customer premises can activate CLOC or CREM loopbacks. All loopbacks shown in
Table 22 can also be initiated from the H2TU-C front-panel MODE and SEL buttons, as described in
Options through MODE and SEL" on page
Name
ARMING or NI LPBK (inband)
ARMING or NI LPBK (ESF Data Link)
IR LPDN or DISARM (inband)
IR LPDN or DISARM (ESF Data Link)
IOR LPBK (NLOC and CREM)
230-232 bit errors
(b)
229-231 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 left-most bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
(BER) on the facility. 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 power down mode. When this code is removed, the
HiGain HDSL2 system returns to its normal unlooped and unarmed state.
52
Table 22, a network tester can activate NLOC or NREM loopbacks (or SMJK, if
11.
Table 22. Addressable Repeater Loopback Commands (A2LB)
Description
Arming code
Arming code
Disarming code
Disarming code
H2TU-C 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)
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
152-388-115-03, Issue 03
"Setting
(a)
(Hexadecimal Equivalent)
-3
Bit Error Ratio
H2TU-C-388 List 1E