Serial Ports 3 And - Cisco VCO/4K Mechanical Assemblies

Description
Serial Port 2/TTY01
(DB-25P)
Male
Pin 2
Pin 3
Pin 5
Pin 6
Pin 7
Pin 8
Pin 20
Figure 6: I/O Module To Remote Maintenance Modem – Cable Wiring Diagram
NOTE: You must use a 9-pin connector (available from Cisco Systems). A 25-pin
connector can be used after the switch box.

3.5 Serial Ports 3 and 4

Serial Ports 3 and 4 are available for Serial I/O (SIO) links between the system and a host
computer. These standard female DB-25 ports carry Asynchronous Data Link Control (ADLC)
protocol signals between the host and the system over RS-232C cables. Pin and signal
assignments for port 3 is the same as Serial Ports 1 and 2. Refer to Table 2 for port 4 pin and
signal assignments.
Wiring conventions for physically connecting a host computer to a SIO port are provided in the
Cisco VCO/4K Hardware Installation Manual. Jumpers on the Storage/Control I/O Module
allow Serial Ports 3 and 4 to be configured as modem (DCE) terminations for connection to a
terminal or configured as terminal (DTE) terminations for connection to a modem. Refer to
Serial Ports 1 through 4 and Jumper Settings on page 1-12 for more information on jumper
configurations.
Data communication parameters for each host link must be defined in the system data base
using the Host Configuration screen following system power-on. Refer to the Cisco VCO/4K
System Administrator's Guide for instructions on defining host links. Additional information
on the ADLC protocol supported by serial host connections is contained in the Cisco VCO/4K
Host Communications Guide.
1-8 Cisco VCO/4K Mechanical Assemblies
(7-conductor, Straight-thru)
TxD
GND
DTR
Remote Maintenance
Modem
(DB-25P)
Male
Pin 2
RxD
Pin 3
CTS
Pin 5
DSR
Pin 6
Pin 7
DCD
Pin 8
Pin 20