24 Port Gigabit Ethernet PoE Switch – User Manual Page 7 of 72
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©2014 MICROSENS GmbH & Co. KG – Hamm/Germany www.microsens.com
2-1-2-2. Cabling Requirements for 1000Base-SX/LX SFP Modules
It is more complex and comprehensive contrast to TP cabling in the fiber media.
Basically, there are two categories of fiber, Multimode (MM) and Single Mode (SM). From
the viewpoint of connector type, there mainly are LC (standard) and BIDI SC.
The following table lists the types of fiber that we support and those else not listed
here are available upon request.
IEEE 802.3z
Gigabit Ether-
net
1000SX 850nm
Multimode Fiber Cable and Modal Bandwidth
Single-mode Fiber 9/125 m
Wavelength and distance depend on used SFP module
Table2-1
2-1-2-3. Switch Cascading in Topology
• Takes the Delay Time into Account
Theoretically, the switch partitions the collision domain for each port in switch cas-
cading that you may up-link the switches unlimitedly. In practice, the network extension
(cascading levels & overall diameter) must follow the constraint of the IEEE
802.3/802.3u/802.3z and other 802.1 series protocol specifications, in which the limita-
tions are the timing requirement from physical signals defined by 802.3 series specifica-
tion of Media Access Control (MAC) and PHY, and timer from some OSI layer 2 protocols
such as 802.1d, 802.1q, LACP and so on.
The fiber, TP cables and devices’ bit-time delay (round trip) are as follows:
TP to fiber Converter: 56
Bit Time unit: 1ns (1sec./1000 M bit)
Bit Time unit: 0.01 s (1sec./100 Mbit)
Table 2-2
Sum up all elements’ bit-time delay and the overall bit-time delay of wires/devices
must be within Round Trip Delay (bit times) in a half-duplex network segment (collision
domain). For full-duplex operation, this will not be applied. You may use the TP-Fiber
module to extend the TP node distance over fiber optic and provide the long haul connec-
tion.
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