Description |
Circuit |
Function |
Shield Ground |
AA |
Also known as protective ground. This is the chassis ground connection between DTE and DCE. |
Signal Ground |
AB |
The reference ground between a DTE and a DCE. Has the value 0 Vdc. |
Transmitted Data |
BA |
Data send by the DTE. |
Received Data |
BB |
Data received by the DTE. |
Request To Send |
CA |
Originated by the DTE to initiate transmission by the DCE. |
Clear To Send |
CB |
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. |
DCE Ready |
CC |
Known as DSR. Originated by the DCE indicating that it is basically operating (power on, and in functional mode). |
DTE Ready |
CD |
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. |
Ring Indicator |
CE |
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 |
CF |
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 (DTE/DCE Source> |
CH/CI |
A control signal that can be used to change the transmission speed. |
Transmit Signal Element Timing (DTE Source) |
DA |
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 (DCE Source) |
DB |
Timing signals used by the DTE for transmission. |
Receiver Signal Element Timing (DCE Source) |
DD |
Timing signals used by the DTE when receiving data. |
Local Loopback / Quality Detector |
LL |
|
Remote Loopback |
RL/CG |
Originated by the DCE that changes state when the analog signal received from the (remote) DCE becomes marginal. |
Test Mode |
TM |
|
Reserved for Testing |
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