Wan Connector And Cables; Isdn S/T Cable - 3Com NETBuilder SI Using Manual

170 A D: C
PPENDIX ONNECTORS AND
Table 23 Maximum Cable Length in Example Collision Domain Diameters
Scenario
No Repeaters
(see Figure 22)
*
One Class 1 repeater
(see Figure 23)
†
One Class 2 repeater
(see Figure 23)
Two Class 2 repeaters
(see Figure 24)
* 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.
WAN Connector
and Cables

ISDN S/T Cable

C
ABLES
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
The WAN connector can be an ISDN S/T (model 43x and 53x), ISDN U
(model 44x and 54x), 56/64 Kbps CSU/DSU (model 45x and 55x), or
T1/FT1 CSU/DSU (model 46x and 56x) connector, depending on the
interface module installed.
To connect a model 43x or model 53x bridge/router to an ISDN network,
use a Category 5 shielded twisted-pair cable with an RJ-45 connector on
both ends. 3Com does not supply this cable.
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
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