Hardware Configuration; Scsi Termination Configuration; Serial Port Configuration; Serial Ports 1 Through 4 And Jumper Settings - Cisco VCO/4K Mechanical Assemblies

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Hardware Configuration

4.0 HARDWARE CONFIGURATION

This section outlines hardware configuration options.

The SCSI Interface connector is reserved for future use.

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 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-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)

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Cisco VCO/4K Mechanical Assemblies

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