Cisco Systems VCO/4K Manual De Usuario
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Cisco VCO/4K Mechanical Assemblies
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Chapter 4
Storage/Control I/O Module
Hardware Configuration
Note
You can use a 36-conductor, straight-through parallel cable to connect a printer to the
system controller. However, only the conductors shown in Figure 4-7are used. For more
information on the parallel 36-pin Centronics cable available from Cisco Systems, refer to
the Cisco VCO/4K Hardware Planning Guide.
system controller. However, only the conductors shown in Figure 4-7are used. For more
information on the parallel 36-pin Centronics cable available from Cisco Systems, refer to
the Cisco VCO/4K Hardware Planning Guide.
SCSI Interface
The SCSI mass storage bus interface on the Storage/Control I/O Module is not used in system operation.
Hardware Configuration
This section outlines hardware configuration options.
SCSI Termination Configuration
The SCSI Interface connector is reserved for future use.
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 the “Serial Ports 1 Through 4” section on page 4-12 for more information.)
terminations for connection to a terminal or configured as terminal (DTE) terminations for connection
to a modem. (Refer to the “Serial Ports 1 Through 4” section on page 4-12 for more information.)
Jumpers are positioned in J1 for Serial Port 1 (master console), JP17 for Serial Port 2 (remote
maintenance modem, and JP13 and JP18 for Serial Ports 3 and 4 (SIO host links), respectively.
maintenance modem, and JP13 and JP18 for Serial Ports 3 and 4 (SIO host links), respectively.
For Serial Ports 1 and 2, these jumper settings assume that straight-through 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.
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.
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-through or crossover) and the host termination at the end of the cable (terminal or
modem).
employed (straight-through 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:
configuration supports the following arrangements:
•
Straight-through cables connecting the system to a modem (DTE to DCE)
•
Crossover (null modem) cables connecting the system to a terminal (DTE to DTE)