Installation
61292006L1-5C
5
Synchronization and LED Indication
The TR OCU DP and TR DDS-R typically require 30 to 90 seconds to reach synchronization.
Once synchronized, the
SYNC
LED turns green. All other LEDs remain off until network occur-
rences cause them to turn on. If the units cannot synchronize, examine the T/R pair for open
(or short) circuit conditions or load coils. For more information, refer to
Front Panel LEDs
The TR OCU DP provides front panel LEDs to display status information.
lists the TR
OCU DP LEDs and status descriptions.
Signal Pair
The TR OCU DP plugs directly into either a WECO-compatible D4 channel bank, AT&T SLC-
96 terminal, or an ADTRAN ACT 1900/2300 channel bank. This requires no special wiring.
The 2-wire loop uses the T/R (Tip and Ring) pair pins 24 and 51 of the D4 backplane. The
Total Reach DDS system is not polarity sensitive.
Table 2. Front Panel LEDs
Label
Status
Description
SYNC
z
z
Green
Red
Loop synchronized
Loop not synchronized
(Red indicates that the is no synchronization between the TR
OCU DP and the remote TR DDS-R; check for continuity, load
coils, and other abnormal line conditions.)
LOOP OPEN
z
Red
No sealing current on local loop
(Check for continuity and proper Total Reach DDS termination
at remote end TR DDS-R.)
CRC
z
Red
Errors on the 2-wire loop
(Check for abnormal loop conditions.)
QM DISC
z
Red
Quality Monitor Disconnect has occurred
NO DSU
z
Yellow
Customer DSU/CSU is not responding or installed, as
determined by the TR DDS-R
NTWK LBK
z
2
Yellow
Flashing Yellow
An OCU loopback toward the network exists at the TR OCU
DP.
A loopback toward the network exists at the TR DDS-R or a
channel loopback at the CSU.
CUST LBK
z
Yellow
Loopback toward the customer exists at the TR OCU DP.
AP
z
2
Green
Flashing Green
Unit has been remotely provisioned.
Flashing: The remote control link is active. Push and hold the
LBK
button for five seconds to toggle between manual and
remote provisioning.
