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CIRCUIT CD - DTE READY (DTR)
CONNECTOR NOTATION: +DTR,-DTR
DIRECTION: To DCE
This signal controls the switching of the DCE to the
communication channel. The DTE will generate this signal to
prepare the DCE to be connected to or removed from the
communication channel.
CIRCUIT LL - LOCAL LOOPBACK (LL)
CONNECTOR NOTATION: LLBK
DIRECTION: To DCE
This signal provides a means whereby a DTE may check the
functioning of the DTE/DCE interface and the transmit and receive
sections of the local DCE.
Note:
The local loopback and remote loopback signals are optional and are
omitted from the DCE configuration of the MPA-200. Since testing will
never occur for this configuration, the test mode signal will always be in
the OFF condition for the DCE. These three test signals follow the
EIA-423-A standard while the remaining signals follow the EIA-422-A
standard.
CIRCUIT RL - REMOTE LOOPBACK (RL)
CONNECTOR NOTATION: RLBK
DIRECTION: To DCE
This signal provides a means whereby a DTE or a facility test
center may check the transmission path up to and through the
remote DCE to the DTE interface and the similar return
transmission path.
35 Quatech Inc., MPA-200/300 Manual