QR-2
QR.1.1 Selecting The Ring Speed
Use jumper P1 to select the MCC-CRIO ring speed.
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
is set at the factory (default configuration) to allow the
connection of Cabletron devices to the RI/RO ports.
You must disable autowrap to connect the RI/RO ports to the devices of
other vendors.
Ring Speed Setting
Put Jumper P1 Sleeve Over
16 Mbps
Pins 1 and 2 (Default setting)
4 Mbps
Pins 2 and 3
NOTE
Autowrap must be enabled at both ends of the cable. Ensure
that the Cabletron device at the other end has autowrap
enabled.
!
CAUTION
If autowrap is disabled, a beaconing condition may occur
before a cable can be attached. To avoid this condition connect
the cable before you insert the MCC-CRIO into the MCC-16, or
perform the connection with the MCC-16 shut off.
