Table 2. Front Panel Indicators; Table 3. Front Panel Loopback Buttons - ADTRAN T200 H2TU-R Installation And Maintenance Manual

Indicator
1222024L6
DSL .........................
DSL
DS1
ALM
ESF/SF
DS1 ..........................
(YEL)(GRN)
B8ZS/AMI
(YEL) (GRN)
LBK
ALM ........................
LOC
L
B
K
REM
ESF/SF ....................
TX
C
M
U
O
S
N
T
RX
B8ZS/AMI ...............
LBK .........................
Front Panel Buttons
Two loopback (LBK) buttons are accessible from the
front panel. The REM loopback button controls a
customer loopback at the H2TU-C. The LOC
loopback button controls a bidirectional loopback at
the H2TU-R. See Table 3 for details.
Front Panel DS1 Monitor Jack
The H2TU-R provides DS1 monitoring bantam jacks.
These jacks provide a nonintrusive monitor point for
DS1 traffic to and from the customer. For more
details, see Section 4 of this practice.
61222024L6-5A

Table 2. Front Panel Indicators

Description
Indicates HDSL2 signal quality on the Loop is in one of the following five states
Off ................. No synchronization of H2TU-C and H2TU-R
Red ................ Poor signal quality on Loop (≥ 10
Yellow ........... Marginal signal quality on Loop (≤ 2 dB margin above 10
Green ............ Good signal quality on Loop (> 2 dB margin above 10
Blinking ......... Detected error on either end
Indicates three possible conditions:
Off ................. Customer-side DS1 signal is absent or is of a format that does not
match the HDSL2 circuit provisioning
Blinking ......... Detected error on the DS1 interface
Green ............ Customer-side DS1 signal is present and synchronized
Indicates three possible alarm conditions:
Off ................. No alarm condition detected
Red ................ Detected local alarm condition (H2TU-R)
Yellow ........... Detected remote alarm condition (H2TU-C)
Indicates three possible framing modes:
Yellow ........... Indicates DS1 is provisioned for ESF framing mode
Green ............ Indicates DS1 is provisioned for SF framing mode
Off ................. Indicates DS1 is provisioned for Unframed operation
Indicates two possible line codes:
Yellow ........... Indicates DS1 is provisioned for B8ZS coding
Green ............ Indicates DS1 is provisioned for AMI coding
Indicates three possible loopback conditions:
Off ................. Unit is not in loopback or armed state
Yellow ........... Active local customer, network or bidirectional loopback at the
H2TU-R
Blinking ......... Unit is armed but not in active loopback condition
Switch
Label
REM .......... Pressing this button changes the H2TU-C customer
LOC ........... Pressing this button changes the H2TU-R
61222024L6-5, Issue 1
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Table 3. Front Panel Loopback Buttons

Function
loopback state as follows:
• If the H2TU-C is not in loopback, pressing
REM activates a customer loopback.
• If the H2TU-C is in loopback, pressing REM
deactivates the loopback.
bidirectional loopback state as follows:
• If the H2TU-R is not in loopback, pressing LOC
activates the bidirectional loopback.
• If the H2TU-R is in loopback, pressing LOC
deactivates the bidirectional loopback.
-7 BER)
-7 BER)
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