ADTRAN D4 OCU DP (ETR) D4-OCU Installation & Maintenance Manual page 3

Switch
SW1-1
On .... Activates error correction
Off .... Deactivates error correction
SW1-2
On .... Selects D4 bank type.
Off .... Unable to select D4 bank type.
SW1-3
On .... Selects SLC-96 bank, Mode I or III.
Off .... Unable to select SLC-96 bank, Mode I or III.
On .... Selects SLC-96 bank, Mode II.
SW1-4
Off .... Unable to select SLC-96 bank, mode II.
On .... Activates zero code suppression.
SW1-5
Off .... Disables zero code suppression.
On .... Enables latching loopback.
SW1-6
Off .... Disables latching loopback.
SW1-7 Leave switch in the off position to select SW56. Enhanced SW56 function has been obsoleted.
Off .... Selects SW56 mode.
SW1-8 On .... Enables use of hardware A/B signaling bits in SW56 mode.
Off .... Disable hardware A/B signaling.
SW1-9
On .... Enables loop signal quality monitoring. Loop disconnects upon detection of poor signal quality.
Off .... Disables loop signal quality monitoring.
SW1-10
On .... Enables extended transmit range. Transmit level is increased for 56 or 64 kbps loops with a loss in excess of
Off .... Disables extended transmit range.
3. CONNECTIONS
The OCU DP occupies one card position in the D4
channel bank. The connector pin assignments are detailed
in Figure 4.
4. TESTING
In the case of equipment malfunction, use the
automated testing capability of the Serving Test Center
(STC) or the faceplate test connectors with portable KS-
20908/20909 or a functionally equivalent test set.
61107.005L2-5C
Table A. SW1 Option Settings
34 dB. Loss of sealing current (open line) overrides ETR. Unit is shipped with this switch in the off position.
Section 61107005L2-5, Issue 3
SW1
ERROR CORRECTION
OFF
D4
OFF
SLC-96 MODE I, III
OFF
SLC-96 MODE II
OFF
ZERO CODE SUPPRESSION
OFF
LATCHING LBK ENABLE
OFF
ENHANCED SWITCHED 56 (OBSOLETE)
OFF
AB SIGNALING
OFF
QUALITY MONITOR
OFF
ETR
Figure 3. SW1
Function
The faceplate contains Bantam jacks for manual testing
(see ADTRAN D4-OCU DP Description practice, Section
61107005L2-2, Testing, for manual testing information).
Loopback Tests
OCU, channel, and optional DSU loopbacks, both normal
and latching, may be activated by issuing the prescribed
commands in accordance with TA-TSY-000077. The
LOOPBACK LED is illuminated when OCU loopback or
channel loopback is activated.
SW1
BANK
TYPE
3