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61181126L2-22A
Warranty: ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service.
Warranty information can be found online at www.adtran.com/warranty
.
HDSL2-Loopback Control Codes
The H2TU-R responds to multiple loopback activation processes. The loopback position is a logic
loopback located within the H2TU-R internal HDSL transceiver.
♦ Manual loopback activation is possible using the control port of the Total Access 3000/3010 SCU.
♦ The H2TU-R responds to HDSL2 loopback codes as defined in ANSI document T1.418-2002.
♦ The H2TU-R responds to manual loopback activation by pressing the
LOC LBK button on the front
panel. This activates a bidirectional loopback at the H2TU-R.
♦ The H2TU-R responds to T1 Network Interface Unit (NIU) loopback codes as described in Bellcore
TR-TSY-000312 if the H2TU-R is optioned for NIU loopbacks.
Name Code Comments
Arming (In-band)
Arming (ESF)
11000
0001 0010 1111 1111
(12 FF Hex)
Signal sent in-band or over ESF data link. HDSL2 elements
in disarmed state make transition to armed state. Detection of
either code results in Smartjack loop-up, if NIU loopback is
enabled.
Activation
(H2TU-C)
Activation
(H2TU-R)
Activation
(H2R)
1101 0011 1101 0011
(D3D3 Hex)
1100 0111 0100 0010
(C742 Hex)
1100 0111 0100 0001
(C741 Hex)
Signal sent in-band. HDSL2 elements in armed state make
transition to loop-up state. Loop-up state time-out is pro-
grammable from the H2TU-C.
If an H2R is present and the units have been armed, the H2R
will loop up toward the network (when sent from the net-
work) or loop up toward the customer (when sent from the
customer). Two seconds of AIS (all 1s) will be sent, five sec-
onds of data will pass, and then ten bit errors will be injected
into the DSX-1 signal. If the pattern continues to be sent, ten
errors will be injected every twenty seconds. When the pat-
tern is removed, the unit will remain in loopback. If the pat-
tern is reinstated, the injection of ten bit errors will resume at
twenty-second intervals.
Deactivation 1001 0011 1001 0011
(9393 Hex)
Signal sent in-band. HDSL2 element loop-up state makes
transition to armed state.
Disarming (in-band)
Disarming (ESF)
11100
0010 0100 1111 1111
(24FF Hex)
Signal sent in-band or over ESF data link. HDSL2 elements
in any state make transition to disarmed state.
Arming Time-out N/A Time-out is two hours.
Loop-up Time-out N/A HDSL2 element in loop-up makes transition to armed state.
Programmable from H2TU-C: None, 20, 60, or 120 minutes.
H2TU-R Network
Loopback
1111 1111 0000 0010
(FF02 Hex)
Loopback data from network toward network at H2TU-R.
H2TU-R Customer
Loopback
0011 1111 0000 0010
(3F02 Hex)
Loopback data from customer toward customer at H2TU-R.
Loopdown All
Units
100
(1in3)
Loopback data from network toward network at H2TU-R.
TROUBLESHOOTING
Front panel or circuit parameters indicate normal operation, as follows:
To check HDSL2 and T1 status, do the following:
1. Connect a terminal or PC to the RS-232 (DB-9) craft interface on the SCU front panel.
2. Select “3” from the ADTRAN HDSL2 Main Menu screen and “2” from the Span Status screen.
This action displays the Detailed HDSL2 and T1 Status screen.
♦ Is the signal quality fluctuating (see MARGIN)? This condition occurs when real time mode is active.
♦ Is the pulse attenuation > 30 dB (see ATTEN)?
♦ Are there any errors counting on the ES, SES, or UAS registers (see ES, SES, and UAS)?
If the answer is “Yes” to any of the above questions, the unit is not functioning properly. A cable
problem or excessive loss situation is probable. There may also be intermittent cable faults or
excessive noise impairments. Conduct more detailed cable testing to verify that all HDSL2 Loop
Specifications are met. If intermittent faults or noise impairments are suspected, select “5” from the
HDSL2 Main Menu to review the Performance History screen.
COMPLIANCE
Refer to the Total Access 3000/3010 H2TU-R Compliance Notice (P/N 61181126L2-17) for detailed
compliance information.
Front Panel Indicators Circuit Parameters
DSL
z Green
♦ LOSS < 30 dB
DS1
z Green
♦ Good signal quality with no fluctuation
ALM
{ Off
♦ All HDSL2 Deployment Guidelines are met
LBK
{ Off
CIRCUIT ID: MM/DD/YY hh:mm
Press ESC to return to previous menu
Detailed HDSL2 and T1 Status
HDSL2 RECEIVER DATA
H2TU-C H2TU-R
-------- --------
MARGIN(CUR/MIN/MAX): 11/00/12 11/00/13
ATTEN(CUR/MAX): 30/30 28/28
ES 15MIN: 001 001
SES 15MIN: 000 001
UAS 15MIN: 014 017
T1 RECEIVER DATA
DSX-1 DS1
------- -------
FRAMING: SF SF
LINE CODE: B8ZS B8ZS
ES-P/ES-L: 001/000 000/001 1. Zero Registers
SES-P/SES-L: 001/000 000/000 2. Restart Min/Max
UAS-P/UAS-L: 000/382 000/391
ALARMS: NONE NONE Selection:
Total Access 3000/3010
H2TU-R