Cabletron Systems MCC-CRIO Quick Reference

The Complete Networking Solut

ion

MCC-CRIO QUICK REFERENCE

QR.1 SETTING SWITCHES AND JUMPERS

P1

P1

SW1

1234

SW1

ON

OFF

1234

Switch Configuration Table

SW1 Settings

On – Enable RI port

1

Off – Disable RI port
On – Enable RO port

2

Off – Disable RO port
On – Enable autowrap on RI

(for connection to Cabletron devices)

3

Off – Disable autowrap on RI
(for use with other vendor devices)

On – Enable autowrap on RO

(for connection to Cabletron devices)

4

Off – Disable autowrap on RO

(for use with other vendor devices)

Location of SW1 Switchblock And Jumper P1

(Default Settings)



Copyright 1997 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9032130-01 July, 1997

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QR.1.1 Selecting The Ring Speed

Use jumper P1 to select the MCC-CRIO ring speed.

Ring Speed Setting Put Jumper P1 Sleeve Over

16 Mbps Pins 1 and 2 (Default setting)
4 Mbps Pins 2 and 3

QR.1.2 Setting Port Configurations

The RI/RO ports have an autowrap capability (transmit phantom current)
to close the ring, when:

• A cable is cut

• A cable fails

• A cable is not attached to a port

The

autowrap capability

connection of Cabletron devices to the RI/RO ports.

Autowrap must be enabled at both ends of the cable. Ensure

NOTE

that the Cabletron device at the other end has autowrap
enabled.

is set at the factory (default configuration) to allow the

You must disable autowrap to connect the RI/RO ports to the devices of
other vendors.

If autowrap is disabled, a beaconing condition may occur

!

CAUTION

before a cable can be attached. To avoid this condition connect
the cable before y ou insert the MCC-CRIO into the MCC-16, or
perform the connection with the MCC-16 shut off.

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