3Com 3C8S5007 - SuperStack II PathBuilder S500 Switch User Manual page 89

Table 16 Maximum Cable Length in Example Collision Domain Diameters
Scenario
No Repeaters
(see Figure 26)
One Class 1 repeater *
(see Figure 27)
One Class 2 repeater †
(see Figure 27)
Two Class 2 repeaters
(see Figure 28)
* A high-delay repeater as specified in IEEE 802.3 standards. A Class 1 repeater usually connects dissimilar media, for instance, UTP to
fiber.
† A low-delay repeater as specified in IEEE 802.3 standards. A Class 2 repeater usually connects similar media, for instance, UTP to UTP.
‡ This scenario is unlikely, because Class 2 repeaters do not usually connect FX to T4.
Figure 28 Collision Domain Diameter with Two Repeaters
F a s t E t
h e r n e t
DTE device
P a t h B u
i l d e r s w
Maximum Combined Cable Length, by Interface
TX and/or T4
100 m
200 m — 100 m max. on
each side of the repeater
200 m — 100 m max. on
each side of the repeater
205 m — 100 m max. per
cable span
F a s t E t
h e r n e t
r e p e a t e
r
r e p e a t e
r
i t c h
FX Only FX & TX
412 m not applicable
272 m 260.8 m
100 m max. TX
Remaining length of FX
320 m 308.8 m
100 m max. TX
Remaining length of FX
228 m 216.2 m
105 m max. total TX, 100
m max. per TX cable span
Remaining length of FX
LAN Connector and Cables
DTE
device
FX & T4
not applicable
231 m
100 m max. T4
Remaining length of FX
304 m ‡
100 m max. T4
Remaining length of FX
263.3 m ‡
105 m max. total T4, 100
m max. per T4 cable span
Remaining length of FX
89