A3Lb And A4Lb Test Procedures; Smartjack Test Procedure - ADC HiGain H2TU-C-202 Manual

Testing
The Armed mode has an automatic time-out of 120 minutes but this timer is reset to 120 for the
following events:
• Loopback terminates (manually or time-out)
• Query
• Alternate query
• Far end activate
• Another ARM command
This timer is inhibited while any of the valid command codes are being sent. Once the codes
are removed, the timer restarts at 120.

A3LB and A4LB Test Procedures

The H2TU-C-202 can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code
1111-1111-0001-1110 (FF1E) for at least 5 seconds. This causes the H2TU-C to enter the NLOC state. The
Loopback Time-out setting (see
this loopback unless it is overridden by the reception of a second identical 16-bit loopup command before the timer
expires. When this time-out override state exists, the only way to loop the H2TU-C down is to issue one of the
three loopdown commands listed in
subsequent loopback sessions.
Table 24 summarizes the codes required to execute Addressable 3 and 4 (A3LB and A4LB) repeater loopback
commands that are identified in List 3E HDSL2 products. All code sequences must be present for at least 5
seconds. Information specific to HiGain HDSL2 regenerators is shown in bold.
Table 24. Addressable Repeater Loopback Commands (A3LB and A4LB)
Name
NLOC
CREM
NREM
CLOC
(a) The leftmost bit arrives first in all sequences. The detection algorithm functions reliably with a random 10
Ratio (BER) on the facility. The entire loopback sequence can also be initiated at the remote H2TU-R location.

SmartJack Test Procedure

The HiGain H2TU-R supports the standard SmartJack loopback which can emulate a Network Interface Device
(NID) for the purpose of loopback testing of the HiGain HDSL2 circuit. SMJK and NREM loopbacks perform the
same functions, but their initiation differs. SMJK indicates that the loopback was initiated by any of the three
SmartJack loopup commands listed in
command or by a command issued from the maintenance terminal.
The SmartJack loopback option, LPBK, enables or disables the ability of the H2TU-R to emulate the family of
SmartJack loopback commands listed in
Inband 3-in-5
Inband 2-in-5
Loopdown
Loopup Code
(a)
Code
11000 11100
(a) These universal loopdown codes can release any and all existing loopup states regardless of loopback direction or method
of initiation. The codes are permanently enabled and independent of all loopback option settings, including the LPBK option.
52
"Setting the Loopback Time-out Option" on page
Table 25 on page
Description
H2TU-C loopup from NI
H2TU-C loopup from CI
H2TU-R loopup from NI
H2TU-R loopup from CI
Table 25. NREM, on the other hand, is initiated by the 3-in-7 inband
Table 25.
Table 25. SmartJack Loopup and Loopdown Commands
Out-of-Band
ESF-FDL Loopup
Codes
1111-1111-0100-1000 1111-1111-0010-0100
February 28, 2001
52. The automatic time-out mode is restored during
(a)
Binary Code (Hexadecimal Equivalent)
1111-1111-0001-1110 (FF1E)
0011-1111-0001-1110 (3F1E)
1111-1111-0000-0010 (FF02)
0011-1111-0000-0010 (3F02)
Out-of-Band
Inband 1-in-6
ESF-FDL Loopdown
Loopup Code
(a)
Codes
100000
LTPH-TP-1005-02, Issue 2
47) determines the duration of
-3
Bit Error
Inband 1-in-3
Loopdown Code
100
H2TU-C-202 List 3E
(a)