Based on this, it’s safe to assume that the cable coming out of your router and going to your service provider is the DTE side, since you service provider sets the speed of the line based on the subscription you have purchased. So what’s the difference between the 2 sides? The DCE side of the cable is the side that sets the speed of the link (also known as clocking). Most serial cables are marked on the connector if it’s the DTE or DCE. When connecting two routers together with a serial cable, one of the routers needs to host the DCE (Data Communications Equipment) side of the cable, and the other will host the DTE (Date Terminal Equipment) side. In order to understand clock rate we first need to understand how the cabling works on routers. In serial interfaces you need to make sure that clock rate and bandwith do match (changing clock rate does not automatically changes bandwith) Otherwise it could happen that your routing protocol does not take into account a link or sets the best route through the wrong link, because of bad settings in bandwith parameter. However, bandwith is the value that will be used in computation of metrics depending on bandwitch, for example in EIGRP. Certified Network Support Professionalīandwidth and Clock Rate on Serial InterfacesĬlock rate is to be used in DCE in serial link to configure the clock speed for the link.
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