ADTRAN Switch HTU C M User Manual

HDSL Quick Start Guide  
5th Gen HTU-C M, P/N 1245001L2  
5th Gen HTU-R, P/N 1245021L1  
PRACTICES  
Please ensure you are properly grounded before setting any function switches.  
HTU-C  
Switch Option Settings  
1245001L2  
(arrows indicate default settings)  
133  
266  
0
Line Build-Out  
Rotary Switch  
DSX-1  
LBO  
399  
EXT  
HTU-C M  
533  
The HTU-C M transfers the local configuration to the HTU-R when circuit synchronization is  
achieved. The HTU-R then sets its configuration to match the HTU-C M.  
AMI  
UFRM  
SF  
EN  
EN  
B8ZS  
FRM  
ESF  
SW1  
NIU LB DIS  
LBK TIMEOUT DIS  
Rotary Switch  
H
D
S
LP1  
TX  
RX  
Used to select operation of the line build-out equalizer in series with the DSX-1 output.  
LP2  
DS1  
ALM  
LBK  
L
E
Q
Function  
Description  
EXT  
0
133  
266  
399  
533  
Selects external line build-out 1  
Line length from 0-133 feet of ABAM cable  
Line length from 133-266 feet of ABAM cable  
Line length from 266-399 feet of ABAM cable  
Line length from 399-533 feet of ABAM cable  
Line length from 533-655 feet of ABAM cable  
R
S
2
3
2
SW1  
SW1-1  
Loopback Timeout  
Enabled  
Disabled  
With SW1-1 at EN, loopback timeout is enabled (20 minutes). 2, 3  
With SW1-1 at DIS, loopback timeout is disabled.  
SW1-2  
SW1-3  
SW1-4  
NIU Loopback  
Enabled  
Disabled  
Programs the ADTRAN HDSL system to respond to traditional T1  
network interface unit (NIU) loop-up and loop-down codes.  
HTU-R  
1245021L2  
Manual Frame Select Frame selection  
SF  
ESF  
LP1  
LP2  
DS1  
ALM  
With SW1-3 at SF, superframe format is selected.  
With SW1-3 at ESF, extended superframe format is selected.  
T1 Framing  
Unframed  
Selects the T1 framing mode  
With SW1-4 at UFRM, unframed operation is selected. SW1-3  
setting is ignored.  
SF  
ESF  
(YEL)  
(GRN)  
Framed  
With SW1-4 at FRM, framed operation is selected.  
AMI  
B8ZS  
(YEL)  
(GRN)  
LBK  
SW1-5  
Manual Code Select  
AMI  
B8ZS  
Selects alternate mark inversion or binary 8 zero substitution codes.  
With SW1-5 at AMI, alternate mark inversion is selected.  
With SW1-5 at B8ZS, binary 8 zero substitution is selected.  
R
E
L
O
C
M
LBK  
TX  
RX  
HTU-R  
REM  
MON  
Function  
Description  
Remote Loopback  
If the HTU-C M is not in loopback, pressing REM activates the  
loopback towards the customer. If the HTU-C M is in loopback,  
pressing REM deactivates the loopback.  
LOC  
Local Loopback  
If the HTU-R is not in loopback, pressing REM activates the  
loopback towards the customer. If the HTU-R is in loopback,  
pressing REM deactivates the loopback.  
1
If external line build-out is selected, the signal transmitted by the HTU-C M is a 12V p-p signal. This must be  
considered when measuring the signal at the DSX EQ faceplate Bantam jack. The signal may appear hotter  
than it should be.  
2
3
Loopback timeout must be selected prior to initiating a loopback.  
60 and 120 minutes is selectable from the craft interface.  
61245.001L2-13A  
Section 61245001L2-13, Issue 1  
1
 

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