Edimax Technology ES-5224RS+ User Manual, Switch Cascading in Topology, 1000Base-X TP, Fiber

User Manual

2-1-3-3. Switch Cascading in Topology

•Takes the Delay Time into Account

Theoretically, the switch partitions the collision domain for each port in switch cascading 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 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
Round trip Delay: 4096		Round trip Delay: 512
Cat. 5 TP Wire:	11.12/m	Cat. 5 TP Wire:	1.12/m
Fiber Cable:	10.10/m	TP to fiber Converter: 56
Bit Time unit: 1ns (1sec./1000 Mega bit)		Bit Time unit: 0.01μs (1sec./100 Mega bit)

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 connection.

⎯1000SX Fiber module: Multi-mode up to 220/275/500/550m by fiber type option

⎯1000LX Fiber module: Single-mode up to 10Km

⎯1000LHX Fiber module: Single-mode up to 30Km

⎯1000ZX Fiber module: Single-mode up to 50Km

•Typical Network Topology in Deployment

A hierarchical network with minimum levels of switch may reduce the timing delay between server and client station. 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. Server/Host is recommended to connect to the Level 1 switch. This is general if no VLAN or other special requirements are applied.

Publication date: July, 2006

Revision A2

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