C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
For more information, refer to the Installation and Maintenance Practice (P/N 61180005L1-5) available online at www.adtran.com.
Total Access
750/850/1500
OCU DP
P/N: 1180005L1
CLEI: SIL112GD_ _
Total Access 750/850/1500 OCU DP Access Module
1180005
OCU-DP
REM
AP
RX
TX
LOGIC
STATUS
NOTE: Error Correction at rates of 56 and 64 kbps require two DS0 time slots for data
and error-correcting parity bytes. If SW56 is selected, Error Correction must
remain OFF.
If 64 kbps is selected, the secondary channel (SC) switch must not be selected.
The OCU DP inserts into any Access Module slot; slots 1 through 24 of the Total Access
1500 chassis or slots 1 through 6 of the Total Access 750/850 chassis. To install the
OCU DP, perform the following steps:
1. If present, remove the Access Module Blank (P/N 1175099L1) from the appro-
priate access module slot of the Total Access 750/850/1500 chassis.
2. Pull the ejector latch, located on the lower left-hand side of the OCU DP front
panel, from its closed position.
3. Hold the OCU DP by the front panel while supporting the bottom edge of the
module with the ejector latch opened to engage the chassis edge.
4. Align the module edges to fit in the lower and upper guide grooves for the access
module slot.
5. Slide the module into the access module slot. Simultaneous thumb pressure at the
top (above the STATUS LED) and at the bottom (to the right of the ejector latch)
of the module will ensure that the module is firmly positioned against the
backplane of the chassis.
6. Secure the OCU DP in place by pushing in on the ejector latch.
The OCU DP becomes operational upon insertion into an active Total Access 750/850/
1500 chassis and performs the power up self-tests. Once the power up self-test is
complete, the front panel LEDs will reflect the true state of the hardware.
FRONT PANEL LEDS
STATUS !Green ......................Normal operating condition
!Red..........................No sealing current, no receive signal, or poor quality
when Quality Monitor option is enabled
!Yellow.....................OCU or Channel Loopback is active
REM !Green ......................Indicates module has been remotely provisioned
4Green (flashing)......Indicates DS-6 control link established
FRONT PANEL SWITCH
AP Alternative provisioning switch. Changes provisioning source from manual
to remote or remote to manual
CONNECTIONS
All connections are made through the 50-pin male amphenol connector on the
backplane of the Total Access 750/850/1500. For OCU DP pair locator information see
the tables on the reverse page.
DESCRIPTION
The ADTRAN® Total Access® 750/850/1500 Office Channel Unit Data Port (OCU
DP) access module provides the interface between a DS0 time slot of the T-carrier data
stream and the 4-wire metallic to the customer premises. The OCU DP may interop-
erate over the carrier system with another OCU DP, DS0 DP, DS0 cross-connect
system, or switch, and may be located in an end office, hub office, intermediate office,
or remote digital terminal system. The OCU DP features the following:
♦NEAR and FAR logic level Bantam test access
♦Non-intrusive monitoring of received data from NEAR or FAR direction
♦Loop Quality Monitor and A/B signalling options
♦Remotely provisionable Performance Monitoring via Digital System-6
INSTALLATION
After unpacking the Total Access 750/850/1500 OCU DP, inspect it for damage. If
damage has occurred, file a claim with the carrier then contact ADTRAN Customer
Service. Refer to the Warranty information on the reverse page.
Verify SW2 and SW4 are provisioned properly for your application. Refer to the table
below for provisioning options.
Switch Label Function/Description
SW2-1 EC Error Correction: ON - Error Correction enabled, *OFF - Error
Correction disabled
SW2-2 ZCS Zero Code Suppression: ON - Zero Code Suppression enabled
*OFF - Zero Code Suppression disabled
SW2-3 LLB Latching Loopback: *ON - responds to legacy latching loopback,
OFF - disables Latching Loopback (ADTRANs protected loopback
mode is activated at 64k only).
SW2-4 A/B AB Signalling: *ON - determines signalling bits from A&B signal-
ling leads on the backplane, OFF - derives signalling bits from
incoming data of the DS0 time slot
SW2-5 Q/M Quality Monitor
SW2-6 No function
SW4-1 SC Secondary channel
SW4-2 64 64 kbps
SW4-3 56 56 kbps
SW4-4 19.2 19.2 kbps
SW4-5 9.6 9.6 kbps
SW4-6 4.8 4.8 kbps
SW4-7 2.4 2.4 kbps
SW4-8 SW56 Switched 56kbps
* Default setting
61180005L1-22C
0502
