ADTRAN D4 OCU DP (ETR) D4-OCU - Manual (Page 4)

4 Section 61107005L2-5, Issue 3 61107.005L2-5C
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+5V
IN CLK
TNEN
TDATA
RSAB
RCLK
RWD
RSQ
-48V
R1
R
FRM GND
-12V
GND
+12V
GND
TWD
TSP
TSQ
RNPCM
RFA
TDCLK
RSP
RNDIS
-48R
T1
IZ
T
Figure 4. Connector Pin Assignments
Faceplate Indicators
The OCU DP has four faceplate LED indicators as
follows:.
LOOPBACK ....... On for OCU or channel loopback.
IDLE CKT ........... On for inactive data channel. Detects
the reception of the idle sequence
from the loop side (DSU/CSU to OCU).
NO SX ................ On for no sealing current. Indicates
detection of no sealing current on the
loop.
AUTO DIS .......... On for auto disconnect. Indicates a
loop disconnect due to poor signal
quality.
5. AUTO LOOP DISCONNECT
On multi-point networks, failure of a single node can
cause the entire network to be inoperable. To prevent
this, the D4-OCU DP incorporates an auto loop
disconnect feature. Loop disconnect occurs when
sealing current is absent or the quality monitor threshold
is exceeded.
If the quality monitoring option is enabled and poor
received signal quality is detected, the loop will be
disconnected and abnormal station control code
(10011110) will be sent toward the network.
This will cause the branch to be blocked at the next
junction (MJU or QMJU). The D4-OCU DP detects poor
received signal quality on the loop by monitoring for
illegal bipolar violations.
6. MAINTENANCE
The D4-OCU DP requires no routine maintenance to
operate properly. In case of equipment malfunction, use
the faceplate test connector and indicators to determine
the trouble source. The faceplate of the D4-OCU DP
contains Bantam test jacks for the KS-20908/20909 or a
functionally equivalent test set. All units contain LEDs as
described in subsection 4.
ADTRAN does not recommend that repairs be performed
in the field. Repair services may be obtained by returning
the defective unit to the ADTRAN Repair Department
(see subsection 7).
7. WARRANTY AND CUSTOMER SERVICE
ADTRAN will replace or repair this product within ten
years from the date of shipment, if the product does not
meet its published specifications or if it fails while in
service. For detailed warranty, repair, and return
information, refer to the ADTRAN Equipment Warranty
and Return Policy and Procedure.
Return Material Authorization (RMA) is required prior to
returning equipment to ADTRAN. ADTRAN does not
recommend that repairs be performed in the field.
For service, RMA requests, or further information, contact
one of the following numbers:
ADTRAN Customer Service:
Applications Engineering ................ (800) 615-1176
(pre-sales support and inquiries)
Technical Support ........................... (800) 726-8663
(post-sales; have unit serial number available)
Sales ............................................... (800) 827-0807
RMA (Repair Service) ..................... (205) 971-8722
Repair and Return Address:
ADTRAN, Inc.
Customer Service Department
901 Explorer Boulevard
Huntsville, Alabama 35806-2807