To make a RJ-48C cable for T1

Posted on 2006-05-02
Last Modified: 2012-06-27
Need to make a RJ-48C cable for T1 point to point.
I searched via google buy only gave me advertisements of actual cables to buy.

I make rj-45 cables myself, now I need to lean how to make a RJ-48 cable.
The better the guide is the better is leanring process aslo. So please help me here.

Thank you all!

Question by:CobolGuy9
    LVL 77

    Expert Comment

    by:Rob Williams

    Author Comment

    hi RobWill
    I need a dummy wiring guide like for rj-45 straight-through

    wires for end one of the cable:
    1)orange-white + 2)orange + 3)green white + 4)green + 5)blue white ++ 6)blue ++ 7)brown-white + 8)brown

    wires for end two of the cable:
    1)orange-white + 2)orange + 3)green white + 4)green + 5)blue white ++ 6)blue ++ 7)brown-white + 8)brown

    LVL 77

    Expert Comment

    by:Rob Williams
    Hi CobolGuy9. I understand the problem. Though I have installed a couple of the cables I have never looked at the pin out. I suspect the equipment end could vary from manufacturer to manufacturer. The T1 end (as in the links) would be constant. The ones I used came with the equipment. The only option I could suggest is to look at the equipment documentation to see if it will tell you which pins are transmit and receive and then match them up to the other end as in the link. Seems to me the equipment end can be different connectors, RJ-45/48, or serial/RS232. Don't quote me on it but I thought the RJ-48C' & S's were straight through cables when using matching ends.

    This is a pretty quiet topic area. I would recommend you post a 20 point "pointer" question in the router TA. There are several experts there who are very familiar with T1 installations. I am not at all. If you can catch the attention of lrmoore or one of the others, I am sure they can steer you in the right direction.
    LVL 22

    Accepted Solution

    1 Receive Ring
    2 Receive Tip
    3 no connection
    4 Transmit Ring
    5 Transmit Tip
    6 no connection
    7 no connection
    8 no connection

    since you're only using two pairs it doesn't really matter on the color scheme, so for example you might use

    1) green 2) green-white 4)blue 5)blue-white

    and it'll be the same on the other end. the only thing you want to watch our for is, what robwill noted, you might be going from a punch-down that has an RJ-45 but your device needs an $J-48C in which case you need some form of adapter.

    Expert Comment

    This site has excellent diagrams and explainations for Straight-Through and Crossover Ethernet as well as the standard T1 crossover.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    What Security Threats Are You Missing?

    Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

    Suggested Solutions

    Article by: user_n
    How Sip Phone (User Agent) works and communicates with sip servers 1.  There is a sip server and a sip registrar.  The sip server and sip registrar can be one server or two different servers. The sip registrar is the server on which it is record…
    As companies replace their old PBX phone systems with Unified IP Communications, many are finding out that legacy applications such as fax do not work well with VoIP. Fortunately, Cloud Faxing provides a cost-effective alternative that works over an…
    To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…
    Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…

    759 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    13 Experts available now in Live!

    Get 1:1 Help Now