Have a T1 smart Jack with a RJ45 demark. Never seen one like this, I ususally work the CO end, not CPE. Question is the RJ45 wired per TIA-568B?

My assumptions are:
Pin 1 Wht/Or, Tip RX Out
Pin 2 Or/Wht, Ring RX Out
Pin 3 Wht/Grn, N/A
Pin 4 Blu/Wht, Ring TX In
Pin 5 Wht/Blu, Tip TX In
Pin 6 Grn/Wht, N/A
Pin 7 Wht/Brn, N/A
Pin 8 Brn/Wht, N/A

I think you have an RJ48 jack, not RJ45. For T1/HDSL it will be wired as an RJ48C (vs. RJ48S for DDS).

Pin 1 Ring1 (XMT to CPE) or/wh
Pin 2 Tip1 (XMT to CPE) wh/or
Pin 4 Ring (RCV from CPE) blu/wh
Pin 5 Tip (RCV from CPE) wh/blu

I know this conforms to some spec (since its the same for all the T1 jacks I've worked with), but I can't say for sure if its per TIA-568B. I got the jack pin-out from the CPE wiring diagram for a Westell DSAWM-204 type-200 T1/HDSL mounting (I'm quite familiar with their products...), and the wire color from a cheat sheet we had lying about (don't know if your connections will be the same).

Joe

Joe thanks for the response. I am certain it is RJ45, it is an 8-pin connector. I figured it out myself the next morning with a T-Bird. I was just hoping I could get a quick answer to save me some fumbling around. Thanks for your time.

FWIW, I guessed right on the pairs.

electech, after doing some more research I found RJ45 and RJ48 are the same plug, just wired slightly different. RJ48C is:

1 Orn/Wht, Ring In
2. Wht/Orn, Tip In
4. Blu/Wht Ring Out
5. Wht/Blu Tip Out

I got 1 & 2 reversed using TIA568B, but it still works, now I know better.

Thanks for taking time to help.

RJ (Registered Jack) designations are a specification for a particular jack/plug, wired to a specific USOC wiring pattern as originally defined in fcc part 68.502, and now defined by some independant industry board that I can't remember the name of, nor can I find the newer designations.

A jack/plug does not gain an RJ designation until it is wired, although there are specific jacks designed for specific applications that could be specified by a RJ designation.. examples might be RJ-31x and RJ-38x jacks which have shorting bars for alarm supervision.

The 8 position modular jack/plug is used for a number of different USOC applications, with differing RJ designations. Ethernet, token ring, etc do not have RJ designations at all.

RJ-61, RJ-41, RJ-45, RJ-48, RJ-31, RJ-38, ethernet, and token ring all use a 8 position modular jack/plug, with different wiring patterns.

I am so disappointed; I stopped in here thinking that I was going to hear something. The only thing I heard was the dog scratching his fleas.

What's your problem?

He is a grumpy old man.

Here is an excellant page on RJ45/48 pinouts: http://www.arcelect.com/RJ48C_and_RJ48S_8_position_jack_.htm

I got the following from a Cisco FAQ page:

Q: What is the difference between RJ48 and RJ45?

RJ48 has a keyed connector and a notched jack.
RJ45 does not have a key or a notch.
Both have 8 pins
Although an RJ45 connector will fit an RJ48 jack, the key on an RJ48 connector will prevent it from plugging into an RJ45 jack.