Signamax 065-7840 24-Port 10/100/1000BaseT/TX Managed Switch
13
2-1-2-3. Switch Cascading in Topology
•
Takes the Delay Time into Account
Theoretically, a switch partitions the collision domain for each port in switch
cascading, so that you may uplink an unlimited number of switches. 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: 0.01
µ
s (1sec./100 Mega bit)
Table 2-2
The sum of all elements’ bit-time delay and the overall bit-time delay of
wires/devices must be within the 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 SFP fiber modules to extend the TP node distance over
long distances via fiber optic cabling and provide long haul connections.
•
Typical Network Topology in Deployment
A hierarchical network with minimum levels of switching may reduce the
timing delay between a server and its client stations. Basically, with this approach, it
will minimize the number of switches in any one path; will lower the possibility of
network loop, and will improve network efficiency. If more than two switches are
connected in the same network, select one switch as Level 1 switch and connect all
other switches to it at Level 2. The Server/Host is recommended to be connected to
the Level 1 switch. This is general practice, if no VLAN or other special
requirements are applied.
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