3. Configuration Options

Table 3-9. DDS Network Physical Interface Options (2 of 2)

Network Initiated DCLB

Possible Settings: Disable, V.54_&_ANSI

Default Setting: V.54_&_ANSI

Allows the initiation and termination of the Data Channel Loopback (DCLB V.54 loop 2) to be controlled by the receipt of a DCLB-actuate or DCLB-release sequence (either V.54 or FT1-ANSI compliant) from the network or a far-end FrameSaver device. When enabled and a DCLB-activate sequence is received, the unit initiates a DCLB on the network interface. When a DCLB-release sequence is received, the DCLB is stopped.

Disable – DCLB-actuate and DCLB-release sequences are ignored.

V.54_&_ANSI – DCLB-actuate and DCLB-release sequences that comply with either V.54 or ANSI T1.403, Annex B standard will be recognized and will control initiation and termination of a DCLB for this frame relay link. The actuate and release sequences do not need to match (for example, a DCLB started with a V.54 actuate sequence can be stopped with an FT1 release sequence).

DSU Latching Loopback

Possible Settings: Enable, Disable

Default Setting: Enable

Specifies whether the FrameSaver unit responds to the DSU Latching Loopback sequence sent by the network, as specified by TR62310.

Enable – Responds to DSU latching loopback commands. The unit remains in loopback until the network receives the loopback release sequence.

Disable – Does not respond to the DSU loopback commands, or terminates the latching loopback test if it is active.

NOTE: Because the latching loopback code is a control sequence, as opposed to a bipolar violation sequence, user data may activate the loopback. Disable this option to stop an unintentional latching loopback.

Require DSU Latching Loopback Preamble

Possible Settings: Enable, Disable

Default Setting: Disable

Specifies whether the FrameSaver unit requires the ANSI or FRF proposed preamble for the network-initiated DSU Latching Loopback when detecting the loopback sequence.

Display Conditions – This option only applies when the unit is operating on a standard

DDS 64KCC circuit and DSU Latching Loopback (64KCC) is enabled.

Enable – Does not respond to the DSU Latching Loopback commands unless the preamble is received.

Disable – Responds to DSU Latching Loopback commands, whether or not the preamble is received.

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December 2002

9000-A2-GB31-00

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Paradyne 9720, and 9820-45M, 9820-2M DDS Network Physical Interface Options 2, Require DSU Latching Loopback Preamble
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and 9820-45M, 9123, 9623, 9783, 9720 specifications

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