B.1 DTE Port
B.1.1 Interface
The connections are on a 25-way D-type female socket on the rear panel of
the unit or the rack. The pin assignments are shown in the following table:
PIN
NAME/FUNCTION
COMMENTS
DIRECTION
1
(GRD) Chassis Ground
Connect one end only
COMMON
2
(TXD) Transmit Data
Data from DTE
IN
3
(RXD) Receive Data
Data from DCE
OUT
4
(RTS) Request to Send
Control from DTE
IN
5
(CTS) Clear to Send
Control from DCE
OUT
6
(DSR) Data Set Ready
Control from DCE
OUT
7
(GND) Signal Ground
Signal reference
COMMON
8
(DCD) Data Carrier Detect
Control from DCE
OUT
9
(+12) 12 volt test
Test
OUT
10
(
–
12) 12 volt test
Test
OUT
14
(TXD) Command Port
Parallel to comm port
IN
15
(TXCLK) Transmit Clock
TX data clock from DCE
OUT
16
(RXD) Command Port
Parallel to comm port
OUT
17
(RXCLK) Receive Clock
RX data clock from DCE
OUT
18
Analogue loop/Make Busy
Test
IN
20
(DTR) Data Terminal Ready
Control from DTE
IN
21
Remote digital loop
Control from DTE
IN
22
(RI) Ring Indicator
Control from DCE
OUT
23
Data Rate Select
Control from DTE
IN
24
(TC) External TX Clock
Control from DTE
IN
25
Test Indicator
Control from DCE
OUT
DTE refers to the computer or terminal attached to DTE interface. DCE
refers to your modem.
B.1.2 Cables
If the modem is to be connected directly to the DTE, the connecting cable
should have straight-through pin-to-pin connections. If the modem is to be
connected to a multiplexer channel, the cable should have cross-over
connections.
X450-310851 Issue 2
B-2
Rev.0
Содержание syncro 1496
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