What does the event "virtual circuit wait" mean?

Hi all !
Can anyone tell me about this event? Yesterday I checked my ASH table and found that most of the time database spends on are 2 "non-idle" events: "db file sequential read" and "virtual circuit wait". I did not find any information about the second event on Metalink or in Documentation. Do i need to pay my attention to this event? DB is 11g on HP-UX.
Thanks in advance!

The Oracle Reference has descriptions of wait events:
[Virtual Circuit Wait|http://download.oracle.com/docs/cd/E11882_01/server.112/e10820/waitevents003.htm#BABBCJEF]
The session waits for a virtual circuit operation to complete.Wait Time: 30 seconds
Parameter      Description
circuit#      Indicates the virtual circuit# being waited on
type      Indicates the type of operation the session is waiting for

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