3Com 4007, Implementation Manual, Page: 158 / 684

158 C
HAPTER
8: E
THERNET
PACE Interactive
Access
PACE Interactive Access (which is called PACE Access on Layer 2 modules)
prevents excessive network jitter (variation in the timing of packet delivery
that can cause garbled sound, jerky images, and delays). PACE
technology also improves timing and optimizes LAN bandwidth
utilization.
Important
Considerations
■
Use PACE Interactive Access only on half-duplex Ethernet links
between a switch and a single end station (this setting has no effect
on full-duplex links).
■
Do not use PACE Interactive Access when a repeater is connected to a
switch port.
Port Monitoring
The Ethernet port monitoring feature can prevent port duplex
mismatches or excessive collisions from interfering with normal traffic
forwarding. When enabled, this feature performs these functions:
■
Monitors 10/100Mbps Ethernet ports for excessive collisions, multiple
collisions, late collisions, runts, and FCS errors
■
Compares these error counters against user-defined thresholds
■
Disables a port that reaches an error threshold
■
Reports the reason that a port is disabled to Switch 4007
management systems
■
Reenables the port after an initial backoff time interval
■
Continues monitoring