IBM 8239 Token-Ring Stackable Hub, Руководство по установке и эксплуатации

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Unwrapping the RI/RO onto the Stack Data Ring
After RI/RO is administratively enabled and is successfully connected to the
external device, the RI/RO status is changed to UNWRAPPED and the RI/RO’s
green status LED is changed to on.
A RI/RO Status trap may be generated to reflect the new RI/RO status.
RI/RO Operational Status and RI/RO LEDs
The possible values for the RI/RO Status and the associated LEDs are:
¹
RI/RO administrative mode is ENABLED
– The RI/RO status is WRAPPED when the RI/RO cannot be successfully
connected to an external device. The green LED is off and the yellow LED
is off.
– The RI/RO status is UNWRAPPED when the RI/RO is successfully
connected to an external device. The green LED is on and the yellow LED
is off.
– RI/RO status is BEACON WRAPPED when the beacon fault is detected to
be off the RI/RO connection. The green LED is on and the yellow LED is
blinking.
¹
RI/RO administrative mode is DISABLED
– RI/RO status is WRAPPED. The green LED is blinking and the yellow LED
is off.
To display the RI/RO’s administrative mode and operational status, issue the
DISPLAY RING_IO terminal interface command.
For information on the meaning of the RI/RO status LEDs, refer to“RI/RO Status”
on page 5-6 .
Stack Concepts
Individual 8239 units can be connected to form a
stack. Each 8239 contains a
Stack In (SI) and Stack Out (SO) port that allows a customer to connect up to eight
8239s via standard Category 5 UTP cabling, providing a total of 256 ports in a
single stack when port expansion cards are used. Any combination of 8239 Model
1s and 8239 Model 2s can be used within a stack. Refer to “Cabling a Stack” on
page 2-5 and “Cable Types and Distances” on page 1-4 for details about cabling
the stack and the types of cable that can be used, respectively.
Install and connect SI/SO cables at both ends before enabling (unwrapping) these
interfaces. Administratively disable (wrap) any of these interfaces that are not going
to be used.
The stack cables provide the medium for the control ring and stack data ring within
the 8239 stack. The control ring is used for internal communications between 8239s
in the stack. The stack data ring (also referred to as just the
stack ring) carries user
data traffic and specifically refers to the ring that forms when multiple 8239s are
connected via their SI and SO ports.
Stack In contains the following elements:
6-10
8239 Setup and User’s Guide