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DCE or DTE device

Posted on 2011-09-18
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Last Modified: 2012-05-12
I wanted to know how I could tell whether a cisco router is a DCE or DTE device?


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Question by:ee4itpro
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by:Don Johnston
ID: 36557780
Cisco serial ports aren't DTE or DCE. They go both ways. ;-)

Whether a port is treated as DTE or DCE is dependent on the cable connected to the port.

That said, in a typical scenario, serial ports on a router operate as a DTE port.
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by:Steve
ID: 36558249
DCE = Data Control Equipment
DTE = Data Terminal Equipment

so for example a PC is a DCE device and an attached Serial device is a DTE device..

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by:MAG03
ID: 36558674
As mentioned above it is dependent on the cable connected to the port.

However to find out what is connected to, let's say serial 0/0, you can enter the command show controllers serial0/0.
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by:Otto_N
ID: 36559315
@PsychoFelix, I disagre  with you:  I've always had DCE as Data Circuit-terminating Equipment.  This used to refer to the little black/beige/blue box the Telco install on your premises to terminate the wire (also called circuit) from them.  I this case, the PC (or router using the Telco servoce) is the DTE, and the modem or NTU is the DCE.
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Otto_N earned 500 total points
ID: 36559372
Oh, I almost forgot to add another method to check DTE/DCE:  Since it is (on Cisco's equipment, at least) determined by the cable, check the cable markings.  It is usually clearly marked "DTE" or "DCE", or if you have the product number, check the last two numbers:  "MT" means "Male, DTE", and "FC" is "Female, DCE".  Also, a regular DCE will terminate in a female connector, while DTE will have a male connector.
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by:MAG03
ID: 36559374
Oops, I was assuming you were using a Cisco device with my previous comment.
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