SignaMax 065-7931 User's Guide Page 19

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Signamax 065-7931 16-Port 10/100/1000BaseT/TX WebSmart Switch
11
2-1-2-3. Switch Cascading in Network Topology
Takes the Delay Time into Account
Theoretically, the switch partitions the collision domain for each port in switch
cascading that you may uplink the switches unlimitedly. In practice, the network
extension (cascading levels & overall diameter) must follow the constraints of the
IEEE 802.3/802.3u/802.3z and other 802.1 series protocol specifications, in which
the limitations are the timing requirement from physical signals defined by 802.3
series specification 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:
1000Base-X TP, Fiber 100Base-TX TP 100Base-FX Fiber
Round trip Delay: 4096 Round trip Delay: 512
Cat. 5 TP Wire: 11.12/m Cat. 5 TP Wire: 1.12/m Fiber Cable: 1.0/m
Fiber Cable : 10.10/m TP to fiber Converter: 56
Bit Time unit : 1ns (1sec./1000 Mega bit)
Bit Time unit: 0.01µs (1 sec./100 Mega bit)
Table 2-2
The sum of all elements’ bit-time delay and the overall bit-time delay of the
wires/devices must be within the Round Trip Delay (bit times) in a half-duplex
network segment (collision domain). For full-duplex operation, this limitation is not
applicable. You may use the SFP module or full-duplex media converters connected
to the TP ports of the switch to extend the TP node distance over fiber optic cabling
and provide the long haul connection.
Typical Network Topology in Deployment
A hierarchical network with minimum levels of switching may reduce the
timing delay between server and client station. Using this approach, the number of
switches in any one path is minimized; this will reduce the possibility of network
loops and will improve network efficiency. If more than two switches are connected
in the same network, select one switch as the Level 1 switch and connect all other
switches to it at Level 2. Servers and/or Hosts are recommended to be connected to
the Level 1 switch. These general recommendations should be followed if no VLAN
or other special requirements are applied.
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