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Home > Forums > Wiring Closet > Cabling > Cabling Forum

RJ48s cable???

Read More Threads Like This One

ph245 (TechnicalUser)

6 Dec 02 21:02

Hi,

I have two cisco routers that have 56/64 csu/dsu, how do I connect the the two routers together. I think it ask for the rj48s cable. I have a crimper cable tool, could I make one with cat5 cable and what is the pin lay out for this.

Thanks a lot.

ben64 (TechnicalUser)

7 Dec 02 18:46

I think you mean RJ-45 but close enough. You want to hook up the two routers. I suggest you go with serial connections between routers, but if you cant, then either a straight or crossover cable will suffice.

The standards for straight are -

1 2 3 4 5 6 7 8
O O/W G B/W B G/W BR BR/W

what i mean by /w is the one with the white stripe
use those pin config's for both sides of the cable.

If that doesn't work - I'm sorry - use that on one side, but the other side, replace O with G

phonebiz (Vendor)

9 Dec 02 12:22

RJ48s is a standard. It specifies pins 1,2,7, and 8 on an RJ45 plug. Pins 1&2 are a pair and 7&8 are a pair. Any straight through standard Cat 5 patch cable will do the job.

KATZEN (IS/IT--Management)

10 Dec 02 12:52

I had this same question/problem a year or so ago. I found a RJ48c to RJ48c cable at Shoplet.com. The one I got was described as "PARADYNE T1 CABLE RJ48C TO RJ48C 20FT" Part number 245374. It worked from my Cisco CSU/DSU to T1 line.
Hope it helps.

ph245 (TechnicalUser)

11 Dec 02 14:33

Thanks everyone!! I found on cisco.com that a rolled RJ-45 is similiar to a RJ-48s cable for this type of connection.

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