Allied Telesis AT-MR908TX - Manual (Page 34)

Installation
14
Collision Domain Diameters
A summary of the collision Domain Diameters is in Table 5:
Table 5: Collision Domain Diameters per IEEE Standard 802.3u
Note
The Collision Domain Diameter for a Class II repeater cannot exceed
205 meters. That is, the hub-to-device connection should never be
more than 100 meters and the inter-repeater should be 5 meters
(Note, however, that this inter-repeater link can be greater if all
device-to-repeater links are shortened. You simply have to ensure
that the Collision Domain Diameter remains at 205 meters.)
You are now ready to operate your AT-MR908TX hubs in a cascaded hub
configuration.
Model All Copper All Fiber
T4 and
Fiber
TX and
Fiber
DTE to DTE 100m 412m na na
1 Class I Repeater 200m 272m 231m* 260.8m*
1 Class II Repeater 200m 320m 304m* 308.8m*
2 Class II repeaters 205m 228m 236.3m** 216.2m**
*Assumes 100m of copper + one fiber link
**Assumes 105m of copper + one fiber link