The Agilent E4594A Cerjac T1 Telco Undercradle is an option for the J2300 series. It provides a comprehensive T1 measurement suite with the power of the J2300's world class internetwork analysis. It has two sets of inputs and outputs for Line 1 and Line 2. Each line has a bantam jack input and output.
Also included is the model E4592A which was offered as an option to this undercradle. The E4592A is a VF Signalling Interface Module with handset jack.
HP / Agilent N1700A