atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring "RJ" designations?

No, USOC codes were prefaced with "RJ", even adapters had RJ codes, such as RJ2AX, which I believe was a two-way duplex splitter.

The numbers you indicated sound like Suttle part numbers, but I am not positive.

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Ed
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How come there's always enough time to go back and fix it a second time?

Yeah, it probably was a Suttle number as they produced the majority of connectors and blocks for the Bell System. (Or the other way around?) 425 blocks were an item. A 4625 was a modular block. When I ordered items from stock at SWB we had to use the part identifier.

Does anyone remember the old phone connector that had four long pins about one inch appart in a box formation?

"4-prong plug and jack"?

Remember them? We still have them in stock! Up until about a year ago, we were still using them but not for phones. We had a retail customer that used them for their cash register network connection.

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Ed
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How come there's always enough time to go back and fix it a second time?

So where does a 4P4C come into history?
4P4C is commonly used for termination of coiled handsets.

I thought RJ9 was a handset cord termination?
Anyway what do you call a "Band-Aid"? Product brand recognition will never change because of memory association. Its still fun to give a customer(IdioT) exactly what they ask for when you know its wrong and go back and charge them twice to change it and educate them. It really makes you feel like you enlightened them.

I don't remember an RJ designation for handset cords, but it makes sense that there would be a uniform standard for them as well. Still, I know that the same cord and jacks work with thousands of different handsets (ie: Trimline, keysets, disposable phones, etc.) and I would think that electrically, the wiring is never the same. True, the transmit is on one pair and the receive is on the other, but what about with say for example, Trimline phones? It's just tip and ring on the handset cord for the newer models.

Man, you hit it right on the head when you mentioned "Band Aid". You'd never say "I just cut my finger, get me an adhesive strip"! That's like Chlorox, Coke, or Jell-o.

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Ed
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How come there's always enough time to go back and fix it a second time?

KUDOS EV607797!!!

Thank you! Thank you!! Thank you!!!

Glad to know I'm not the only one who is regularly irritated by this uneducated simplification of terminology. I can't tell you how many times I've had customers ask for "RJ45" data jacks.

Therein starts the whole education process. 8P8C, 6P6C, 6P4C, 6P2C and 4P4C describes the connector and plug whereas USOC RJ##x or EIA/TIA T568A, T568B, etc., etc. is the wiring topology ("scheme"). The few times a customer was adament about using RJ45's, they soon started second guessing themselves when I told them we required a signed, written specification and that rewiring when it doesn't work would COST $$$!

By the way, I believe a handset 4P4C may be a USOC RJ22.

Thanks "ev", for your post!

To: BRADYLAND & DTU

Re: Clarification of modular jack and plug "hardware"

8P8C = 8 Position 8 Conductor
(Specify Category 3 or 5)

6P6C = 6 Position 6 Conductor

6P4C = 6 Position 4 Conductor

4P4C = 4 Position 4 Conductor

The word "Position" refers to the jack size (width) and number of slots in the plug. "Conductor" is self explanatory, referring to how many copper "terminals" are included in the connecting hardware.

In today's world, Category 5 8P8C's are used for data connections and wired either as EIA/TIA T568A or T568B. Cateory 3 8P8C's can be wired with 8 conductors and used for the rare occurance of 4-line KSU-less feature-phones. If I am remembering correctly (and it is 01:38 in the morning so who know's what I'm writing here) this is a USOC RJ48. There are also some older 8P8C wiring topologies ("schemes").

6P6C and 6P4C hardware are generally used for voice connections, wired with either 6 (USOC RJ25), 4 (USOC RJ14) or 2 (USOC RJ11) conductors based on the application.

The 4P4C is generally used for handset connections as mentioned in previous posts. However, in the last few years I have seen one manufacturer using the 4P4C's (with a flat not coiled cord) for a system programming interface cable.

Hope that helps!