Serial - Data Communication Equipment (DCE)
DCE stands for Data Circuit-terminating Equipment or Data Communication Equipment. It is a term used to describe the equipment that provides the clocking signal and manages the data flow over the serial link. Here’s a detailed explanation:
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Role of DCE:
- The DCE is responsible for generating the clock signal that synchronizes the communication between devices on a serial link. This is crucial because, in serial communication, both ends must agree on the timing to correctly interpret the transmitted data.
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Typical DCE Devices:
- In a network setup, devices like modems, CSU/DSUs and certain types of routers can act as DCE. In a lab or testing environment, a Cisco router can also be configured to act as DCE.
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Serial Link Configuration:
- In a serial connection, there are typically two devices involved: the DCE and the DTE. The DTE is usually a terminal, computer, or a router, and the DCE is the device that provides the clocking.
- When setting up a serial link between two routers, one router will be configured as the DCE and the other as the DTE. The DCE side will provide the clock rate.
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Setting Clock Rate on Cisco Routers:
- To configure a Cisco router as a DCE, you connect the serial interface using a special DCE cable. Then, you set the clock rate on the DCE router using the
clock rate
command in the interface configuration mode. For example:Router(config)# interface serial 0/0 Router(config-if)# clock rate 64000 - This command sets the clock rate to 64 Kbps, which synchronizes the data transmission rate on the serial link.
- To configure a Cisco router as a DCE, you connect the serial interface using a special DCE cable. Then, you set the clock rate on the DCE router using the
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Identifying DCE and DTE Cables:
- The type of cable used in the connection often determines whether the device will act as a DCE or DTE. Typically, the DCE cable will have a female connector, and the DTE cable will have a male connector.
Understanding the role of DCE in a serial link setup is crucial for network engineers when configuring and troubleshooting serial connections on Cisco routers. Proper clocking ensures reliable data transmission and communication between network devices.
Links
https://forum.networklessons.com/t/eigrp-static-neighbor/1244/32?u=lagapidis