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
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