Chapter 3: Installation
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62.5/125-μm multimode Gigabit fiber with multimode LC SFP module (LGB200C-MLC).
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9/125-μm single-mode Gigabit fiber with single-mode LC SFP module (LGB200C-SLC10 orLGB200C-SLC30).
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9/125-μm single-strand single-mode Gigabit fiber with BiDi LC1310-nm SFP module (LGB204C).
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9/125-μm single-strand single-mode Gigabit fiber with BiDi LC1550-nm SFP module (LGB205C).
The following table lists the types of fiber that the switch supports and those not listed here are available upon request.
Multimode Fiber Cable and Modal Bandwidth
Multi-mode 62.5/125 m
Multimode 50/125 m
Modal Bandwidth
Distance
Modal Bandwidth
Distance
160MHz-Km 220m 400MHz-Km
500m
IEEE 802.3z
Gigabit Ethernet
1000BASE-SX 850nm
200MHz-Km 275m 500MHz-Km
550m
Single-mode fiber 9/125 m
Single-mode transceiver 1310nm 10Km
1000BASE-LX/LHX/XD/ZX
Single-mode transceiver 1550nm 30, 50Km
TX (Transmit) 1310nm
Single-mode
*20Km
RX (Receive) 1550nm
TX (Transmit) 1550nm
1000BASE-LX
Single Fiber
(BIDI LC)
Single-mode
*20Km
RX (Receive) 1310nm
3.3.3 Switch Cascading in Topology
Theoretically, the 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 and overall diameter) must comply with the IEEE 802.3/802.3u/802.3z and
other 802.1 series protocol specifications, which limit the timing requirement from physical signals defined by the Media Access Control
(MAC) and PHY802.3 series specification, and timing from some OSI layer 2 protocols such as 802.1d, 802.1q, and LACP.
The fiber, TP cables, and devices’ bit-time (round-trip) delay are described in Table 3-1.
Table 3-1. Cable’s bit-time (round-trip) delay.
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 s (1sec./100 Mega bit)
The sum of 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 apply. You may use the TP-Fiber module to extend the TP
node distance over fiber optic cable and provide the long haul connection.
3.3.4 Typical Network Topology in Deployment
A hierarchical network with minimum levels of switches may reduce the timing delay between server and client station. This approach 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 a Level 1 switch and connect all other switches to it at Level 2. We
recommend connecting the Server/Host to the Level 1 switch, if no VLAN or other special requirements are applied.
