Form 34 should tell you where it's pointed. On that release, it's probably a dataset 1103 or DS 2103. This will look like a flat box the size of a book lying on its side, possibly beneath a telephone.

The input will be an extension port, using pins 3/6 of the jack (NOT 4/5!!). Obviously you must have a 4-conductor line-cord to make this work, as a 2-conductor won't connect 3/6.

The output from the DS 1003 or DS 2103 will be serial, in a format determined in Maintenance (Off the top of my head I want to say SYSTEM, SHOW, PORT, PMS_PORT but it's been a while, so play it by ear).

Hope that helps.

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