37 PIN D-SUB MALE at the DTE (Computer).
37 PIN D-SUB FEMALE at the DCE (Modem).
||Also known as protective ground. This is the chassis ground connection between DTE and DCE.
||The reference ground between a DTE and a DCE. Has the value 0 Vdc.
||Data send by the DTE.
||Data received by the DTE.
||Request To Send
||Originated by the DTE to initiate transmission by the DCE.
||Clear To Send
||Send by the DCE as a reply on the RTS after a delay in ms, which gives the DCEs enough time to energize their circuits and synchronize on basic modulation patterns.
||Known as DSR. Originated by the DCE indicating that it is basically operating (power on, and in functional mode).
||Known as DTR. Originated by the DTE to instruct the DCE to setup a connection. Actually it means that the DTE is up and running and ready to communicate.
||A signal from the DCE to the DTE that there is an incomming call (telephone is ringing). Only used on switched circuit connections.
||Received Line Signal Detector
||Known as DCD. A signal send from DCE to its DTE to indicate that it has received a basic carrier signal from a (remote) DCE.
||Data Signal Rate Select
|A control signal that can be used to change the transmission speed.
||Transmit Signal Element Timing
|Timing signals used by the DTE for transmission, where the clock is originated by the DTE and the DCE is the slave.
||Transmitter Signal Element Timing
|Timing signals used by the DTE for transmission.
||Receiver Signal Element Timing
|Timing signals used by the DTE when receiving data.
||terminal In Service
||Signal that indicates that the DTE is available for operation
||A control signal from the DTE to the DCE. It instructs the DCE to rapidly get ready to receive a new analog signal. It helps master-station modems rapidly synchronize on a new modem at a tributary station in multipoint circuits
||A signal return for receiver circuit reference
||Local Loopback / Quality Detector
||A control signal from the DTE to the DCE that causes the analog transmision output to be connected to the analog receiver input.
||Signal from the DTE to the DCE. The local DCE then signals the remote DCE to loopback the analog signal and thus causing a line loopback.
||Signal from the DCE to indicate if it is uses the normal communication or standby channel
||A return signal for transmitter circuit reference
||A signal from the DTE to tell the DCE which of the two analog carrier frequencies should be used.
||A signal from DTE to DCE, to switch between normal communication or standby channel.
||A signal from the DCE to the DTE that it is in test-mode and can't send any data.
||Reserved for Testing