Module Switching; Automatic Ring Speed Detection; Active Port Retiming And Jitter Reduction - 3Com CoreBuilder 5000 User Manual

1-2 I
NTRODUCTION

Module Switching

Automatic Ring
Speed Detection
Active Port Retiming
and Jitter Reduction
Ports on the same module can be part of as many as 11 different rings.
Using per-port switching, you can move ports (and therefore users)
from ring to ring using a console attached to the hub management
module or SNMP-based network management system.
Internal management features such as automatic ring speed detection
ensure that newly-inserted ports do not disrupt ring operation.
CoreBuilder 5000 Token Ring per-module switching modules can be
switched on a per-module basis to any of 10 CoreBuilder 5000
backplane rings or to one isolated ring.
Internal management features such as automatic ring speed detection
ensure that newly-inserted modules do not disrupt ring operation.
CoreBuilder 5000 Token Ring Media Modules provide automatic ring
speed detection. Automatic Ring Speed Detection is a feature that
prevents a station from entering an active ring if the station is
configured for a speed other than the active ring's speed. This
wrong-speed detection is implemented per port, and works
automatically with speed sensing Token Ring Adapter cards.
For example, if you try to attach a station configured at 4 Mbps to an
active ring configured at 16 Mbps, the CoreBuilder 5000 Token Ring
circuitry prevents the station from entering the ring before the station's
wrong speed causes a beaconing interruption.
CoreBuilder 5000 Token Ring ports and modules actively retime and
regenerate incoming signals, effectively increasing achievable link
distances.
Active retiming – Allows greater cable lengths over lower-grade
cabling, and helps ensure reliable connections. For example,
CoreBuilder 5000 Active Port Retiming Token Ring supports a
16 Mbps Token Ring over Level 3 UTP cable at distances of up to
100 meters.
Jitter attenuation – Is a feature that increases both the achievable
link distances and maximum number of stations.