ADTRAN D4-OCU Table A. SW1 Option Settings, Connections, Testing, Loopback Tests, Switch

OFF OFF

OFF

SW1

O 1 2 3

N

SW1

O 1 2 3 4 5 6 7 8 9 10

N

ERROR CORRECTION

D4

BANK

SLC-96 MODE I, III

OFF

4

SLC-96 MODE II

TYPE

OFF OFF OFF OFF OFF

5 6 7 8 9 10

ZERO CODE SUPPRESSION LATCHING LBK ENABLE ENHANCED SWITCHED 56 (OBSOLETE) AB SIGNALING

QUALITY MONITOR ETR

	Figure 3. SW1
	Table A. SW1 Option Settings
Switch	Function
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.
SW1-4	On .... Selects SLC-96 bank, Mode II.
	Off .... Unable to select SLC-96 bank, mode II.
SW1-5	On .... Activates zero code suppression.
	Off .... Disables zero code suppression.
SW1-6	On .... Enables latching loopback.
	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
	34 dB. Loss of sealing current (open line) overrides ETR. Unit is shipped with this switch in the off position.

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.

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.

61107.005L2-5C Section 61107005L2-5, Issue 3 3