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+ +	3.1		+ Serial Point-to-Point Links
	+ 3.1.4		+ DTE-DCE

+ + + + + + +

+ + A serial connection has a data terminal + equipment (DTE) device at one end of the connection and a data + communications equipment (DCE) device at the other end. The connection + between the two DCEs is the WAN service provider transmission network. The CPE, which is generally a router, is the DTE. + Other DTE examples could be a terminal, computer, printer, or fax + machine. The DCE, commonly a modem or CSU/DSU, is the device used to + convert the user data from the DTE into a form acceptable to the WAN + service provider transmission link. This signal is received at the + remote DCE, which decodes the signal back into a sequence of bits. + This sequence is then signaled to the remote DTE. +

+ Many standards have been developed to + allow DTEs to communicate with DCEs. The Electronics Industry + Association (EIA) and the International + Telecommunication Union Telecommunications Standardization Sector (ITU-T) have been most active + in the development of these standards. +

The DTE-DCE interface for a particular + standard defines the following specifications:

Mechanical/physical – Number + of pins and connector type
Electrical – Defines voltage + levels for 0 and 1
Functional – Specifies the + functions that are performed by assigning meanings to each of the + signaling lines in the interface
Procedural – Specifies the + sequence of events for transmitting data

If two DTEs must be connected together, + like two computers or two routers in the lab, a special cable called a + null-modem is necessary to eliminate the need for a DCE. For + synchronous connections, where a clock signal is needed, either an + external device or one of the DTEs must generate the clock signal.

The synchronous serial port on a router + is configured as DTE or DCE depending on the attached cable, which is + ordered as either DTE or DCE to match the router configuration. If the + port is configured as DTE, which is the default setting, external + clocking is required from the CSU/DSU or other DCE device.

The cable for the DTE to DCE connection + is a shielded serial transition cable. The router end of the shielded + serial transition cable may be a DB-60 connector, which connects to + the DB-60 port on a serial WAN interface card. The other end of the + serial transition cable is available with the connector appropriate + for the standard that is to be used. The WAN provider or the CSU/DSU + usually dictates this cable type. Cisco devices support the EIA/TIA-232, + EIA/TIA-449, V.35, X.21, and EIA/TIA-530 serial standards.

To support higher densities in a + smaller form factor, Cisco has introduced a smart serial cable. The + serial end of the smart serial cable is a 26-pin connector + significantly more compact than the DB-60 connector.

+ + + + +

+ + + + + +

+ + + + Interactive Media Activity

+ +

PhotoZoom: DCE/DTE Cable

In this + PhotoZoom, the student will view DCE and DTE cable.

+ +

+ + + + + + + + +

+ + + + + +

+ + Web Links

+ + +

High-Speed Serial Interface (HSSI)

+ + http://www.cisco.com/univercd/cc/ + td/doc/ cisintwk/ito_doc/ hssi.htm

+ +

+ + +

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