RJ45 and RJ48 question

Posted on 2004-10-28
Medium Priority
Last Modified: 2008-03-03
We are about to switch ISPs and currently our ISP provides us with our CSU/DSU so we have purchased a new cisco 2611xm router with a WIC-1DSU-T1 card for our CSU/DSU.  Currently our ISP uses a cable with RJ45 connectors on both ends to go from thier box on the wall  to their CSU/DSU. We are switching to Bellsouth and they tell me their box/demark will have an RJ48 female jack.  I know that an RJ45 cable can plug into an RJ48 outlet with no problem (not visa versa though).  The WIC-1DSU-T1 CSU/DSU has a female RJ45 outlet on it.  My quesion is what kind of cable to I need to go from the new Bellsouth RJ48 to the WIC-1DSU-T1. According to


i need a RJ-45 to RJ-45 straight-through cable (provided by customer) but will this work since the Bellsouth demark is actually a RJ48?? and will the inouts be correct??
Question by:mikeleebrla

Accepted Solution

TannerMan earned 2000 total points
ID: 12434606
Since the rj-48 in this scenario is pin'd the same as an rj-45 (using pins 1/2 and 4/5) you'll be fine.
Just make sure you leave your current connection active till you have tested. On switch over day just try it and you can always switch back.
LVL 25

Author Comment

ID: 12434727
Thanks,, that is what i thought but i just wanted to be sure

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Originally, this post was published on Monitis Blog, you can check it here . It goes without saying that technology has transformed society and the very nature of how we live, work, and communicate in ways that would’ve been incomprehensible 5 ye…
In this article I will be showing you how to subnet the easiest way possible for IPv4 (Internet Protocol version 4). This article does not cover IPv6. Keep in mind that subnetting requires lots of practice and time.
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…

623 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