DCE V.24 (RS-232), clock stopped

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Feb 15th, 2009
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I am trying to connect a smart serial interface on the router to RS232 modem.

Serial interface goes up, but line protocol is down. When doing sh controllers serial 0/0/0 I get DCE V.24 (RS-232), clock stopped message. What does it mean? Have I got a missmatching cable? The thing is that I had Cisco SmartSerial-to-RS232(male cable) and we remade it to SmartSerial-to-RS232 female DCE cable.

Thank you in advance!

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Giuseppe Larosa Mon, 02/16/2009 - 00:02
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Hello Fuad,

the RS-232 is asynchronous serial, how have you configured the router serial interface ?

It should be configured for async mode I suppose.

Post you config and the sh controller serial

Hope to help


fgasimzade Mon, 02/16/2009 - 00:12
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interface Serial0/0/0

no ip address

encapsulation x25 dce

no ip mroute-cache

x25 address 1050000002

x25 htc 16

x25 win 7

x25 wout 7

x25 threshold 2

clock rate 9600

This is config from a working router, where we used original cisco cable. The same config I got on the router I was talking about.

#sh controllers serial 0/0/0

Interface Serial0/0/0

Hardware is GT96K

DCE V.24 (RS-232), clock stopped

idb at 0x62A5F710, driver data structure at 0x62A61A2C

wic_info 0x62A62028

Physical Port 0, SCC Num 0

Also, can you please explain me the difference between cisco cables CAB-SS-232FC and CAB-SS-232FC-EXT? Specificly, the number of RS232 pins, is it the same?

Giuseppe Larosa Tue, 02/17/2009 - 00:16
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Hello Fuad,

you have opened another thread about the cables


So I expect some other collegue has answered there.

Said this, coming back to this thread if configuration is fine the problem is probably on the cable that you said is hand made.


I see you didn't get a positive answer there in the other thread.

I cannot find the cable name you have provided.

I looked on the cisco web site.

RS-232 is a 25 pin cable spec.

Cisco Serial cables go out with a 60 pin cable for synch serials.

To assembly the required you need a cable converter from cisco serial cable to 25 pin rs-232

see for example:


table 19

So post a sh ver to understand exactly what type of serial is in your router.

or verify if the serial interface have a 60 pins output.

see also


this is for a 50 pin cable to 25 pin

Hope to help



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