artwork from MSI Communications' page
Electrical Network Connection:
From one to twenty five single or multiple pair circuits bridged to the network or other connected equipment.
Circuits are provided on numbered tip and ring positions on a miniature 50 pin connector of the "Amphenol" or "telco" type. Pins 1 (ring) and 26 (tip) are considered position 1. Pins 2 (ring) and 27 (tip) are position 2 on thru twenty five pairs.
Many key and PBX systems specifiy the RJ21X as the network interface device. Many of these systems also use the RJ21X, or "Amphenol" as a connector for stations or telephone sets, wired from the KSU or PBC main distribution frames.
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