ascom
Ascotel 2025/2045/2065
HBT_20321104_04/B0_en
Cabling Interfaces
4.73
7.5
Special Interfaces
4
7.5.1 V.24 Interface
V.24 Standard
V.24 is a serial interface used for connecting a printer or PC. In accordance with
the V.24 recommendation, a cable length of 15 m limits the transmission speed
to 38 400 bit/s. The system's maximum transmission speed is 115,200 bit/s. The
cable length must not exceed 2 m. Transmission errors can occur if these limits are
exceeded. A current loop converter (TTY) has to be used if the cable length is
insufficient. Cable lengths of up to 1 km are possible with this interface.
Two types of equipment can be connected to the V.24 interface:
• DCE: Data Communication Equipment
• DTE: Data Terminal Equipment
The pin assignment differs according to the type of equipment used.
Signals are specified as follows:
Tab. 4.45:
V.24 signals
A straight connecting cable (modem cable; uncrossed) must be used when con-
necting DTE-type equipment with DCE-type equipment (e.g. PC
®
modem,
modem
®
PC).
Signal
Pin
Signal direction
CCITT stand-
ard V.24
Name / function
D-Sub-9
D-Sub-25
DTE
DCE
TXD
3
2
out
in
103
Transmitted Data
RXD
2
3
in
out
104
Received Data
RTS
7
4
out
in
105
Request To Send
CTS
8
5
in
out
106
Clear To Send
DTR
4
20
out
in
108
Data Terminal Ready
DSR
6
6
in
out
107
Data Set Ready
DCD
1
8
in
out
109
Data Carrier Detect
SGND
5
7
—
—
102
Signal Ground
Содержание Ascotel 2025
Страница 1: ...Ascotel ISDN telecommunications system from ascom Ascotel 2025 2045 2065 System Manual...
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Страница 167: ...ascom Ascotel 2025 2045 2065 1 112 Ascotel Information Management System AIMS HBT_20321104_01 B0_en...
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