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RJ45 and RJ48 question

Posted on 2004-10-28
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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

http://www.cisco.com/en/US/products/hw/routers/ps214/products_tech_note09186a00801f5d89.shtml

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??
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Question by:mikeleebrla
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    LVL 9

    Accepted Solution

    by:
    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.
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    Author Comment

    by:mikeleebrla
    Thanks,, that is what i thought but i just wanted to be sure
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