9
VHSI Port Interface Specifications
VHSI Port Interface Specifications
The standards compliant with each interface supported on the VHSI ports are
listed in the table below. The rest of this section describes the allocation of pins
used to implement the electrical and signalling requirements of each interface.
A wiring diagram is also provided, to show the correspondence of the interface
pinout to the VHSI port.
Interface
Standard
Compatibility
V.24
CCITT V.24
Signalling
CCITT V.28
Electrical
CCITT X.21bis
Electrical and signalling
EIA RS-232-C
Electrical and signalling
ISO 2110
Connector type for the DCE side of a V.24 VHSI
Modem Cable
V.35
CCITT V.28
Some signals for electrical
CCITT V.35
Some signals for electrical and signalling
ISO 2593
Connector type for the DCE side of a V.35 VHSI
Modem Cable
EIA-530
RS-422
Electrical
RS-423
Electrical
ISO 2110
Connector type for the DCE side of a EIA-530 VHSI
Modem Cable
V.36/RS-449
CCITT V.10
Electrical
CCITT V.11
Electrical
RS-422
Electrical
RS-423
Electrical
ISO 4902
Connector type for the DCE side of a V.36/RS-449
VHSI Modem Cable
X.21
CCITT X.21
Signalling
CCITT V.11
Electrical
CCITT X.27
Electrical
EIA RS-422-A
Electrical
ISO 4903
Connector type for the DCE side of an X.21 VHSI
Modem Cable
Table 3: Interface Compatibility
