Bob Grow (Intel) – introduction to Study Group List of Isochronous Requirements for RE: (* could be done in 802.3, ** partially in 802.3) Fully supports 802.1 *Low cost (zero additional perceived cost per unit to consumer) MAX 500uSec DELAY THROUGH EACH HOP (illustrated by Gibson) Performance requirements are based on 7 hops maximum (3.5 milliseconds) *Provide master clock with which all stations’ clocks maintain bounded phase delay (illustrated by Pioneer, lip-sync and digital speaker scenarios) *Phase delay (between master and station clock) short term jitter maximum is within a few microseconds *Phase delay (between master and station clock) long term jitter (drift) asymptotically approaches zero *Isochronous traffic only supported over 100Mbps or greater full-duplex *At least 75% of link bandwidth may be reserved for isochronous traffic *At least 10% of link bandwidth is reserved for best-effort traffic *Assumed cycle size is 8kHz (very widely used) **Network provides a mechanism to request/assign resources for isochronous transmission (e.g. bandwidth, channel) and the default rule(s) for managing the resources *Isochronous packets are never dropped nor delayed due to ANY other network traffic *Granularity (not minimum) of bandwidth allocation is on the order of single bytes per cycle By default, resource allocation is first-come-first-serve **Network will automatically reclaim previously allocated but currently unused resources **Isochronous traffic is not disrupted when a station/session is added/removed to/from the network Allows bridging to isoch 802.11e Allows bridging to isoch 1394