Polycom SpectraLink 6300 MCU - Manual (Page 34)

Facility Preparation: SpectraLink 6000 System: SpectraLink 6300 MCU
PN: 1725-36121-001_J.doc 34
Connect demarc block 25-pair cable
In some installations the demarc block is connected to the Interface
Module using a 25-pair Telco cable with one male and one female RJ-
21 connector. The female connector is plugged into the right side of
each cross-connect block. The male connector from each cable will be
connected later to the front of the Interface Module.
Be sure to use only cables that are UL-listed communications circuit
accessories. Only 24 of the 25 pairs are used in the Interface
Module cable.