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Telco

Category 3 & Telco Cables — T1, RJ11/RJ12 & 25-Pair Riser Assemblies

This section covers our Cat3 and telco-grade copper cables for voice, T1, key systems, and legacy low-speed data. You’ll find flat satin RJ11/RJ12 cords for station wiring plus 25-pair telco riser cables with 50-pin and 64-pin connectors—many proudly made in the USA.

See the “Abbreviations” chart at the bottom of the page for definitions and decoding.

Cables Connectors Cable Management Accessories & Tools

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Term Meaning What It Indicates
Cat3 Category 3 Voice / low-bandwidth cable for POTS, PBX, and 10BASE-T.
T1 T1 circuit cable Shielded pair construction tuned for 1.544 Mb/s T1 services.
CMR Communications Riser Riser-rated jacket for vertical shafts and floor-to-floor runs.
RJ11 / RJ12 6-position modular plug Flat satin cords for phones; RJ11 = 2–4 wires, RJ12 = 6 wires.
50-Pin / 64-Pin Telco “Amphenol” connectors Multi-pair connectors used to land 25-pair (50-pin) or higher-pair trunks.
Male / Female Connector gender Determines whether it mates with a panel jack (female) or plug (male).
Blunt Cut cable end Opposite end is unterminated for hard wiring into blocks or frames.
Shielded Foil or braid shield Improved noise immunity for T1 and sensitive voice/data circuits.
Gruber Communications