LevelOne FGP-2472 User Manual
Page 19
13
Gigabit Fiber with BiDi-SC 1550nm SFP module
The following table lists the types of fiber that we support and those else not
listed here are available upon request.
IEEE 802.3z
Gigabit Ethernet
1000SX 850nm
Multi-mode Fiber Cable and Modal Bandwidth
Multi-mode 62.5/125
µ
m
Multi-mode 50/125
µ
m
Modal
Bandwidth
Distance
Modal
Bandwidth
Distance
160MHz-Km
220m
400MHz-Km
500m
200MHz-Km
275m
500MHz-Km
550m
1000Base-
LX/LHX/XD/ZX
SFP.0LC.212.10/30/50/70/B0 Km
Single-mode Fiber 9/125
µ
m
Single-mode transceiver 1310nm 10Km
Single-mode transceiver 1550nm 30, 50, 70, 110Km
1000Base-LX
Single Fiber
WDM Module
SFP.0BL.621.202
Single-Mode
*20Km
TX(Transmit) 1310nm
RX(Receive) 1550nm
SFP.0BL.621.201
Single-Mode
*20Km
TX(Transmit) 1550nm
RX(Receive) 1310nm
Table2-1
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
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
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.