Cisco Systems VCO/4K specifications Serial Ports 3, Ethernet Interface

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Chapter 4 Storage/Control I/O Module

Description

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 EIA/TIA-232 cables. Pin and signal assignments for port 3 is the same as Serial Ports 1 and 2. Refer to Table 4-2for 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 Guide. 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 the “Serial Ports 1 Through 4 and Jumper Settings” section on page 4-11for more information on jumper configurations.

Data communication parameters for each host link must be defined in the system database 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.

Table 4-2 Serial Ports 3 and 4 Pin and Signal Assignments1

Pin

Signal Name

Description/Direction

 

 

 

2

TxD

Transmit Data (terminal to modem)

 

 

 

3

RxD

Receive Data (modem to terminal)

 

 

 

4

RTS

Request to Send (terminal to modem)

 

 

 

5

CTS

Clear to Send (modem to terminal)

 

 

 

6

DSR

Data Set Ready (modem to terminal)

 

 

 

7

GND

Chassis Ground

 

 

 

8

DCD

Data Carrier Detect (modem to terminal)

 

 

 

15

RTxC

Tx Clock to output data (terminal to modem)

 

 

 

17

RRxC

Rx Clock to input data (terminal to modem)

 

 

 

20

DTR

Data Terminal Ready (terminal to modem)

 

 

 

24

TTxC

Tx Clock to output data (terminal to modem)

 

 

 

1. All pins not identified are no-connection.

Ethernet Interface

The CPU employs a Local Area Network Controller for Ethernet (LANCE) to implement an Ethernet transceiver interface. The balanced transceiver signal lines from the CPU are coupled to an onboard transformer to signal lines that go through the SWI, Outer B/P and control midplane cards, and terminate on the industry-standard DB-15 connector on the Storage/Control I/O Module faceplate. Pin and signal assignments for this DB-15 port are listed in Table 4-3.

Cisco VCO/4K Mechanical Assemblies

 

78-10334-03

4-9

 

 

 

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Contents Storage/Control I/O Module SpecificationsDescription Front Panel Indicators and Ports AssignmentsStorage/Control I/O Module Front Panel Hard Disk Drive Hard disk drive Hard disk drive LEDs Midplane ConnectorsSerial Ports 1 Pin Signal Name Description/DirectionGND Ethernet Interface Serial Ports 3Printer Interface Pin Signal Signal NameScsi Termination Configuration Hardware ConfigurationSerial Port Configuration Serial Ports 1 Through 4 and Jumper SettingsPort DTE Operation DCE Operation Serial Ports 1 ThroughJumper Configuration for DCE/DTE, Serial Ports Removal and Replacement Information11 Storage/Control I/O Module Location Removal Procedures Troubleshooting Replacement ProceduresLEDs Not Illuminated Troubleshooting Reference Materials

VCO/4K specifications

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