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¹
Control In (CI) for stack communications between 8239s
¹
Data In (DI) for the stack data ring
Stack Out contains the following elements:
¹
Control Out (CO) for stack communications between 8239s
¹
Data Out (DO) for the stack data ring
SI/SO Configuration Options
CI/CO and DI/DO are unwrapped under normal conditions so that stack
communications can occur between 8239s in the stack and all user traffic can flow
across the stack data ring. The default value for CI/CO and for DI/DO is
UNWRAPPED, which is the setting required for normal operation. These
connections are automatically unwrapped onto the control ring or data ring provided
that the ring has normal operational status.
Commands are available to wrap or unwrap CI/CO and DI/DO administratively, but
these commands are usually reserved for problem isolation and are not used for
normal operation. The wrap commands are:
Note: Issuing the wrap commands can affect connectivity, so use the following
terminal interface commands with extreme care.
¹
WRAP/UNWRAP CONTROL_IO for affecting stack connectivity
¹
WRAP/UNWRAP DATA_IO for affecting User traffic connectivity
The ability to change the status of CI/CO is not available via SNMP.
To display the current wrap settings, issue the DISPLAY WRAP_POINTS terminal
interface command.
CI/CO and DI/DO Up/Down Traps
The 8239 can be configured to send a CI/CO and DI/DO up/down trap whenever
the status of the CI/CO and DI/DO changes. To display this parameter, issue the
DISPLAY TRAP_SETTINGS terminal interface command and look at the values of
Control IO Status Up Down and Data IO Status Up Down. The default value for
both items is ENABLED.
To change the value of the Control_IO Up Down trap_setting and the Data_IO Up
Down trap setting, issue the ENABLE/DISABLE TRAP_SETTING
CONTROL_IO_STATUS_UP_DOWN and the ENABLE/DISABLE TRAP_SETTING
DATA_IO_STATUS_UP_DOWN terminal interface commands, respectively.
For more information about traps, refer to “Trap Processing” on page 7-10.
SI/SO LEDs
There are three LEDs on each SI/SO connector: a green LED, a yellow LED, and
another green LED.
The leftmost green LED indicates the wrap status for DI/DO, the stack data ring.
The rightmost green LED indicates wrap status for CI/CO, the stack control ring.
Green LED on indicates a status of unwrapped. Green LED blinking indicates a
status of administratively unwrapped. Green LED off means that the status is
wrapped.
Chapter 6. Concentrator Functions
6-11
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