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Page 17
Chapter 3: Installation
Table 3-1. Fiber supported by the switch.
Fiber cable type Multimode Fiber Cable and Modal Bandwidth
IEEE 802.3z Gigabit
Ethernet 1000BASE-SX,
850 nm
Multimode 62.5-/125-µm Multimode 50-/125-µm
Modal Bandwidth Distance Modal Bandwidth Distance
160 MHz-km 721.7 ft. (220 m) 400 MHz-km 1640.4 ft. (500 m)
200 MHz-km 902.2 ft. (275 m) 500 MHz-km 1804.5 ft. (550 m)
1000BASE-LX/LHX/ZX
Single-mode fiber 9/125 m
Single-mode transceiver 1310 nm, 6.2 mi. (10 km), or 18.6 mi. (30 km)
Single-mode transceiver 1550 nm, 31.1 mi. (50 km)
1000BASE-LX single
fiber (BiDi SC)
Single-mode 12.4 mi. (20 km)
TX (Transmit) 1310 nm
RX (Receive) 1550 nm
Single-mode 12.4 mi. (20 km)
TX (Transmit) 1550 nm
RX (Receive) 1310 nm
Switch Cascading Topology
The switch cascading topology takes the delay time into account.
Theoretically, the switch partitions the collision domain for each port in switch cascading so that you can uplink an unlimited
number of switches. In practice, the network extension (cascading levels and overall diameter) must follow the constraints of the
IEEE 802.3/802.3u/802.3z and other 802.1 series protocol specifications. The limitations are the timing requirement from physical
signals defined by 802.3 series specification of Media Access Control (MAC) and PHY, and the timer from some OSI layer 2
protocols such as 802.1d, 802.1q, LACP (for LGB2118A only), and so on.
The fiber, TP cables, and devices’ bit-time delay (round trip) are as follows:
Table 3-2. Fiber, TP cables, and devices’ bit-time delay (round trip).
1000BASE-X TP Fiber 100BASE-TX TP 100BASE-FX Fiber
Round-trip delay: 4096 Round-trip delay: 512
CAT5 TP wire 11.12/m CAT5 TP wire 1.12 m Fiber cable 1.0/m
Fiber cable 10.10/m TP to fiber converter: 56
Bit time unit 1 ns (1 sec/1000M) Bit time unit: 0.01 s (1 sec/.100 Megabit
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 does not apply. You may use the
TP-Fiber module to extend the TP node distance over fiber optic and provide the long-haul connection.