Avaya 555-233-116 manual DS1/T1 CPE loopback jack9, Installing a loopback jack, With a smart jack

DS1/T1 CPE loopback jack9

This chapter provides information on how to install and use a DS1 loopback jack to test the DS1 span between the Avaya Media Server or Gateway and the network interface point. The loopback jack is required when DC power is at the interface to the integrated channel service unit (ICSU).

NOTE:

Do not remove the loopback jack after installation. It should always be available for remote tests of the DS1 span.

NOTE:

For G700 Media Gateway systems, the channel service unit (CSU) is integrated within the MM710 board. This means that there is no need for a separate external device. For earlier media gateway systems, the integrated channel service unit (ICSU) — also known as the 120A2 — is a separate device that plugs into the back of the media gateway.

For G700 Media Gateway systems, the loopback jack isolates the MM710 internal CSU from the DC power and properly loops the DC span power.

Installing a loopback jack

You can install a loopback jack with or without a smart jack.

With a smart jack

Install the loopback jack at the interface to the smart jack, if possible. This position provides maximum coverage of CPE wiring when remote loopback tests are run.

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