11
Standalone G-Converter
TECHNICAL: 0118 931 2233
Selection and Configuration Of DCE Interface
The DCE port of the G-Converter can be presented as either X.21/V.11 or V.35 Choice of
interface is made by link setting. The X.21/V.11 interface is presented on a 15-way D type
connector in accordance with ISO 4903. The V.35 interface is also presented on the same 15
way D-type connector. A converter cable is optionally available.
X.21/V.11 Interface
Selection of the interface is made by link settings – refer to
Appendix D -Location Of
Switches and Links
for the location diagram. To select the X.21/V.11 interface Link 9
jumper must be in the X.21 position. The connector pin out for the X.21 interface is given in
Appendix G
Control Of “I” Lead
When the X.21/V.11 interface is selected, the “I” lead function can be controlled. The “I”
lead status is synthesised by the converter since no information about the “I” lead status is
passed across the link. Status of the “I” lead is fixed. Four choices are available to the user.
Selection is made via switch settings. Refer to the location diagram in
Appendix D -
Location Of Switches and Links
SW4, 4
SW4, 5
FUNCTION OF I LEAD
OFF
OFF
I follows C lead
OFF
ON
I = active
ON
OFF
I = inactive
ON
ON
I follows carrier
V.35 Interface
Selection of the interface is made by link settings – refer to
Appendix D -Location Of
Switches and Links
for the location diagram. To select the V.35 interface link 9 must be in
the V.35 position. The V.35 interface is presented on the 15 way D-type connector. Two
“control flags” are available as outputs and one “control flag” is available as an input. The
V.35 specification calls for the following Control signals;
V.35 CONTROL FLAG SIGNALS
Name
Description
Type at Connector
Signal number
RTS
Request To Send
Input
105
CTS
Clear To Send
Output
106
DSR
Data Set Ready
Output
107
DCD
Data Carrier Detect
Output
109
