4
SYNCHRONOUS MODEM ELIMINATORS SME–422, –V.35, –530, –X.21
2.2 LED Indicators
The six LED indicators on the front panel of the SMEs function as follows:
2.3.1 T
RANSMIT
D
ATA
(TXD)
Lit when the device connected to J1 is sending data.
2.3.2 R
ECEIVE
D
ATA
(RXD)
Lit when the device connected to J1 is receiving data.
2.3.3 R
EQUEST TO
S
END
(RTS)
Lit when the device connected to J1 raises RTS.
2.3.4 C
LEAR TO
S
END
(CTS)
Lit when J1 is clear to send.
Figure 2-1. Typical SME applications.
SME–X.21
MAINFRAME
COMPUTER
MAINFRAME
COMPUTER
Length of Cable;
422 Interface
specified
MAINFRAME
OR MINI
SME-422
REMOTE
CONTROLLER
MINI, OR
MAINFRAME
SME–422, SME–V.35, or
SME–530
,
