3Com 3C8S5007 - SuperStack II PathBuilder S500..., User Manual

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LAN Connector and Cables 89
Figure 28 Collision Domain Diameter with Two Repeaters
Fast Ethernet repeater
Fast Ethernet repeater
DTE
device
DTE device
PathBuilder switch
Table 16 Maximum Cable Length in Example Collision Domain Diameters
Maximum Combined Cable Length, by Interface
Scenario TX and/or T4 FX Only FX & TX FX & T4
No Repeaters
(see Figure 26) 100 m 412 m not applicable not applicable
One Class 1 repeater *
(see Figure 27)
200 m — 100 m max. on
each side of the repeater
272 m 260.8 m
100 m max. TX
Remaining length of FX
231 m
100 m max. T4
Remaining length of FX
One Class 2 repeater
†
(see Figure 27)
200 m — 100 m max . on
each side of the repeater
320 m 308.8 m
100 m max. TX
Remaining length of FX
304 m
‡
100 m max. T4
Remaining length of FX
Two Class 2 repeaters
(see Figure 28) 205 m — 100 m max . per
cable span
228 m 216.2 m
105 m max. total TX, 100
m max. per TX cable span
Remaining length of FX
263.3 m
‡
105 m max. total T4, 100
m max. per T4 cable span
Remaining length of FX
* 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.