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Auto-Negotiation and Speed Sensing
The EDS’s RJ45 Ethernet ports independently support auto-negotiation
for transmission speeds of 10 Mbps, 100 Mbps, and 1000 Mbps, with
operation according to the IEEE802.3 standard.
This means that some nodes could be operating at 10 Mbps, while at the
same time, other nodes are operating at 100 Mbps or 1000 Mbps.
Auto-negotiation takes place when an RJ45 cable connection is made, and
then each time a LINK is enabled. The EDS advertises its capability for
using 10 Mbps, 100 Mbps, or 1000 Mbps transmission speeds, with the
device at the other end of the cable expected to advertise similarly.
Depending on what type of device is connected, this will result in
agreement to operate at a speed of 10 Mbps, 100 Mbps, or 1000 Mbps.
If an EDS’s RJ45 Ethernet port is connected to a non-negotiating device,
it will default to 10 Mbps speed and half-duplex mode, as required by the
IEEE802.3 standard.
Specifications
Technology
Standards
IEEE 802.3 for 10BaseT,
IEEE 802.3u for 100BaseT(X) and 100Base FX,
IEEE 802.3ab for 1000BaseT,
IEEE 802.3z for 1000BaseSX/LX/LHX/ZX
Flow Control
EEE 802.3x flow control, back pressure flow control
Interface
RJ45 Ports
10/100BaseT(X) and 10/100/1000BaseT(X) auto
negotiation speed
Fiber Ports
100Base-FX or 1000Base-X SFP slot
LED Indicators
PWR1, PWR2, 10/100M, 10/100M/1000M, 100M,
1000M
Optical Fiber: 100 or 1000Base SFP modules
Gigabit Ethernet
SFP-SX
SFP-LX
SFP-LHX
SFP-ZX
Wavelength
850nm
1310nm
1310nm
1550nm
Max.TX
-4 dBm
-3 dBm
1 dBm
5 dBm
Min.TX
-9.5 dBm -9.5 dBm
-4 dBm
0 dBm
RX Sensitivity
-18 dBm
-20 dBm
-24 dBm
24 dBm
Link Budget
8.5 db
10.5 dB
20 dB
24 dB
Typical Distance
550 m
a
275 m
b
1100 m
c
550 m
d
10 kme
40 km
e
80 km
f
Saturation
0 dBm
-3 dBm
-3 dBm
-3 dBm
a. 50/125 μm, 400 MHz*km fiber optic cable
b. 62.5/125 μm, 200 MHz*km fiber optic cable
c. 50/125 μm, 800 MHz*km fiber optic cable
d. 62.5/125 μm, 500 MHz*km fiber optic cable
e. 9/125 μm, 3.5 PS/(nm*km) fiber optic cable
f. 9/125 μm, 19 PS/(nm*km) fiber optic cable
