Serial Ports 1 Through 4 - Cisco VCO/4K Mechanical Assemblies

You can position the jumpers in locations JP13 and JP18 (under the "To Terminal" etching) to
configure the CPU as a DCE termination. Moving the jumpers to these locations supports the
following SIO connections:
• Straight-thru cables connecting the system to a host terminal (DCE to DTE)
– or –
• Crossover (null modem) cables connecting the system to a modem (DCE to DCE)
Refer to the Cisco VCO/4K Hardware Installation Manual for more information on serial cable
requirements.
NOTE: When modifying jumper positions on Storage/Control I/O Module boards,
all 7 jumpers must be moved to the new location to insure operation.

Serial Ports 1 through 4

Serial ports 1 through 4 can be configured as a modem (DCE) for connection to a terminal, or
terminal (DTE) for connection to a modem. The Storage/Control I/O Module card's serial ports
are configured for shipment in the DCE configuration. The following table illustrates jumper
positions for DCE and DTE.
Port
1 Jumper –TO MODEM JP11
2 Jumper – TO MODEM JP17
3 Jumper – TO MODEM JP14
4 Jumper – TO MODEM JP19
Refer to Figure 8 for the jumper locations on the Storage/Control I/O Module card.
DTE Operation
Hardware Configuration
DCE Operation
Jumper – JP1 TO TERMINAL
Jumper – JP16 TO TERMINAL
Jumper – JP13 TO TERMINAL
Jumper – JP18 TO TERMINAL
Storage/Control I/O Module 1-13