Hardware Configuration
1-12
Cisco VCO/4K Mechanical Assemblies
4.0 HARDWARE CONFIGURATION
This section outlines hardware configuration options.
4.1 SCSI Termination Configuration
The SCSI Interface connector is reserved for future use.
4.2 Serial Port Configuration
Serial Ports 1 through 4 and Jumper Settings
Serial ports 1 through 4 on the Storage/Control I/O Module can 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 for more information.)
Jumpers are positioned in
J1
for Serial Port 1 (master console),
JP17
for Serial Port 2 (remote
maintenance modem, and
JP
13 and
JP
18 for Serial Ports 3 and 4 (SIO host links), respectively.
For Serial Ports 1 and 2, these jumper settings assume that straight-thru EIA (DCE to DTE)
cables are used to connect the system to the master console and remote maintenance modem.
If the jumpers are moved to position
JP11
(for the master console) and
JP16
(for the remote
modem), crossover cables can be used.
NOTE: Straight-through cables directly link the connector pinouts from end-to-end.
In crossover cables, Pins 2 and 3 are crosswired; Pin 2 at one end is wired to Pin 3
at the opposite end, and vice versa.
Jumper settings for Serial Ports 3 and 4 (SIO host links) are determined by two factors: the
type of cable employed (straight-thru or crossover) and the host termination at the end of the
cable (terminal or modem).
The default jumper settings for Serial Ports 3 and 4 configure the CPU as a DTE termination.
This configuration supports the following arrangements:
•
Straight-thru cables connecting the system to a modem (DTE to DCE)
– or –
•
Crossover (null modem) cables connecting the system to a terminal (DTE to DTE)
