ADCP-61-471 • Issue 4 • June 2000 • Section 2: Operation and Maintenance

DLP-541

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Note: The ACT CUST and ACT NET options create customer and network loopbacks on the HLXC and HLXR cards. The SEND LPBK option does not apply to loopbacks on the local HLXC or HLXR cards. Instead, the SEND LPBK option sends a request out to the DS3 MUX and into the network to request that a loopback be established on the associated DS1 facility at the other end of the network connection. This request is denoted graphically by the text “<LPBK RQ” that appears on loopback screens.

The corresponding DS1 on the other side of the network connection should respond to this request by establishing a loopback on the corresponding remote unit. The receipt of this request via the DS3 network interface is denoted graphically by the text “LPBK RQ>” that appears on loopback screens.

Note: The SEND LPBK option is only available in the Soneplex Broadband system. It can only be executed from the Local command toggle field on the Loopback Status/Commands screen when the DS1 Loopback Mode field on the DS3 MUX Configuration screen is configured as C-Bit parity.

Reference: DLP-529DS3 MUX Configuration

Note: The “DEACTIVATE” command can be performed at any field that does not display “N/A”, and will deactivate all loopbacks. You must deactivate the currently active loopback to activate another loopback.

Note: Only applicable loopback actions for the unit will be displayed.

8. The following message appears:

Modifying LOOPBACK status…

Are You Sure? (y/n)

9.Enable your selection by pressing Y for yes or cancel your selection by pressing N for no. When you press Y, the screen will disappear for a few seconds. The screen will then display the currently active loopback.

Note: The Programmable Loopback Armed State read-only field displays either ARMING DISABLED or ARMED. [loopback arming TAP]

Reference: DLP-573HLX Loopback Configuration

Note: At the MPU 5.2 Craft Interface when both loops on any HDSL loop segment are down, no loopbacks at units downstream of the condition may be activated. The Loopback screen will show “N/A” under the name of any affected unit’s column (i.e., LOCAL, REPEATER, REPEATER1, REPEATER2, or REMOTE). HDSL loop segments that may be affected include the loops between:

•the HLXC and the HLXR (no repeater)

•the HLXC and the HRX (one repeater)

•the HRX and the HLXR (one repeater)

•the HLXC and the HRX1 (two repeaters)

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© 2000, ADC Telecommunications, Inc.