Figure 2. Htu-C M R Switch Arrangement - ADTRAN HTU-C M R Installation And Maintenance Manual

Faceplate Indicators
The HTU-C M R has five faceplate LEDs which
indicate operational status. Table 5 defines these
LEDs.
Table 5. Front Panel Indicators
Indicator Description
LP1 ............. Indicates five possible states of the quality of the HDSL
signals on Loop 1.
Off .............. No synchronization of HTU-C and
Red ............. Poor signal quality on Loop 1
Yellow ......... Marginal signal quality on Loop 1
Green ......... Good signal quality on Loop 1
Blinking ...... An error detected on either end of
LP2 ............. Indicates five possible states of the HDSL signals on
Loop 2.
Off .............. No synchronization of HTU-C and
Red ............. Poor signal quality on Loop 2
Yellow ......... Marginal signal quality on Loop 2
Green ......... Good signal quality on Loop 2
Blinking ...... An error detected on either end of
DSX ........... Indicates the following three conditions.
Off .............. Network-side DSX-1 signal is absent
Blinking ...... Bipolar violation (BPV), frame bit
On solid ...... Network-side DSX-1 signal is
ALM .......... Indicates the following three conditions.
Off .............. No alarm condition detected.
Red ............. Alarm condition detected either
Yellow ......... Remote alarm condition detected.
LBK ........... Indicates three possible loopback states.
Off .............. Unit is not in loopback or armed
Blinking ...... The loopback arming sequence has
On solid ...... Local (HTU-C) loopback is active.
4
HTU-R on Loop 1
-7
(>10 BER)
(≤2 dB margin above 10 -7 BER)
-7
(>2 dB margin above 10 BER)
Loop 1 will cause this LED to blink
briefly
HTU-R on Loop 2
(>10 -7 BER)
-7
(≤2 dB margin above 10 BER)
-7
(>2 dB margin above 10 BER)
Loop 2 will cause this LED to blink
briefly
or is of a format that does not match
the provisioning of the HDSL circuit.
error (SF mode), or CRC error (ESF
mode) detected at DSX-1 signal.
present and synchronized.
locally (HTU-C), or locally and
remotely (HTU-C and HTU-R).
state.
been detected. In this state, the unit is
armed (ready for loopback) but not in
loopback.
Section 61245001L6-5, Issue 7
Powering Options
Using Jumper P3, illustrated in Figure 2, the
HTU-C M R can be optioned for two different span
powering modes. By strapping P3 for "L" span
powering mode, the HTU-C M R will provide span
powering -140 Vdc. This mode allows span
powering of circuits without HREs or with one
HRE.
By strapping P3 for the "H" span powering mode,
the HTU-C M R will provide span powering at
less than -190 Vdc. This mode allows span
powering of circuits with two HREs and an HTU-R.
Framing
The HTU-C M R can be optioned to operate either
in Auto Framed or Unframed mode via Jumper P4,
illustrated in Figure 2. The default setting is Auto.
HTU-C
1 2 4 5 0 0 1 L 6
EXT
DSX-1
LBO
0
CUSTOMER LOSS OF SIGNAL
LBK TIMEOUT DIS
B88ZS
T1
LP1
E
LP2
H Q
D
DSX
S
L
ALM
LBK
R
S
2
3
2
UNF L
P4 P3
AUTO H
UNF
AUTO

Figure 2. HTU-C M R Switch Arrangement

533
399
266
133
AIS
LBK
CDI
EN
AMI
FT1
TX
RX
L
P4 P3
H
61245001L6-5G