Black Box Gigabit Smart Switch Eco Fanless, LGB2118A Fiber supported by the switch, 100BASE-TX TP

Chapter 3: Installation

Table 3-1. Fiber supported by the switch.

Fiber cable type	Multimode Fiber Cable and Modal Bandwidth
	Multimode 62.5-/125-µm		Multimode 50-/125-µm
IEEE 802.3z Gigabit	Modal Bandwidth	Distance	Modal Bandwidth	Distance
Ethernet 1000BASE-SX,
850 nm	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)
	Single-mode fiber 9/125 m

1000BASE-LX/LHX/ZX 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)

TX (Transmit) 1310 nm

Single-mode 12.4 mi. (20 km)

1000BASE-LX single fiber (BiDi SC)

RX (Receive) 1550 nm

TX (Transmit) 1550 nm

Single-mode 12.4 mi. (20 km)

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.

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