means for retrieving {HEAD ~ a station number} from the queues, including means for sensing the end of a message packet supplied to the star coupler, and in response issuing a queue advance signal to retrieve {TAIL ~ an item} from the queues 
means for retrieving { HEAD ~ a station number } from the queues , including means for sensing the end of a message packet supplied to the star coupler , and in response issuing a queue advance signal to retrieve { TAIL ~ an item } from the queues
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH