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device varies according to the com bination ofinput and output streams and the movementwithin the stream from channelto channel. Data received on an input stream must first be stored in Data Memory before it is sent out. As information ente rs the IDT72V8980 it m ust first pass throug h an internal serial-to-parallel co n ve rte r. Likewise, befo re data leaves the device, it m ust pass through the internal parallel-to-serialconverter. This data preparation has an effect on the channel positioning in the frame immediately following the incoming frame-mainly, data cannotleave in the same time slot, on in the time slot im mediately following. Therefore,information that is to be outputin the same channel position as the info rmation is input, relative to the frame pulse, will be output in the following frame. As well, information switched to the channel immediately following the input channel will not be output in the time slot immediatelyfollowing butin the next timeslotallocated tothe outputchannel, one framelater. Whether information can be output during a following timeslot after the information enteredtheIDT72V8980dependsonwhich RXstream thechannel information enters on and which TX stream the information leaves on. This situation is caused by the orderin which input stream information is placed into Data Memory and the orderin which stream information is queued for output. Table l shows the allowable input/output stream combinations forthe minimum 2 channel delay.