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Communication Protocols - GE L60 Instruction Manual

Line phase comparison system, ur series.
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2.2 SPECIFICATIONS
RS232
Front port:
RS485
1 or 2 rear ports:
Typical distance:
2
Isolation:
ETHERNET (FIBER)
PARAMETER
10MB MULTI-
Wavelength
820 nm
Connector
Transmit power
–20 dBm
Receiver sensitivity
–30 dBm
Power budget
Maximum input
–7.6 dBm
power
Typical distance
1.65 km
Duplex
Redundancy
The UR-2S and UR-2T only support 100 Mb multimode
ETHERNET (10/100 MB TWISTED PAIR)
Modes:
Connector:
SNTP clock synchronization error: <10 ms (typical)
2-18
®
19.2 kbps, Modbus
RTU
®
Up to 115 kbps, Modbus
RTU, DNP 3
1200 m
2 kV, isolated together at 36 Vpk
FIBER TYPE
100MB MULTI-
100MB SINGLE-
MODE
MODE
MODE
1310 nm
1310 nm
ST
ST
SC
–20 dBm
–15 dBm
–30 dBm
–30 dBm
10 dB
10 dB
15 dB
–14 dBm
–7 dBm
2 km
15 km
full/half
full/half
full/half
yes
yes
yes
10 MB, 10/100 MB (auto-detect)
RJ45
L60 Line Phase Comparison System
2 PRODUCT DESCRIPTION

2.2.8 COMMUNICATION PROTOCOLS

ETHERNET SWITCH FIBER OPTIC PORTS
Maximum fiber segment length calculation:
The maximum fiber segment length between two adjacent
switches or between a switch and a device is calculated as fol-
lows. First, calculate the optical power budget (OPB) of each
device using the manufacturer's data sheets.
OPB
P
=
(
T MIN
where OPB = optical power budget, P
and P
= receiver sensitivity.
R
The worst case optical power budget (OPB
lated by taking the lower of the two calculated power budgets, sub-
tracting 1 dB for LED aging, and then subtracting the total insertion
loss. The total insertion loss is calculated by multiplying the num-
ber of connectors in each single fiber path by 0.5 dB. For example,
with a single fiber cable between the two devices, there will be a
minimum of two connections in either transmit or receive fiber
paths for a total insertion loss of 1db for either direction:
Total insertion loss
number of connectors 0.5 dB
=
2
×
0.5 dB
=
The worst-case optical power budget between two type 2T or 2S
modules using a single fiber cable is:
OPB
OPB 1 dB (LED aging)
=
WORST
10dB 1dB
1dB
8dB
=
To calculate the maximum fiber length, divide the worst-case opti-
cal power budget by the cable attenuation per unit distance speci-
fied in the manufacturer data sheets. For example, typical
attenuation for 62.5/125 μm glass fiber optic cable is approxi-
mately 2.8 dB per km. In our example, this would result in the fol-
lowing maximum fiber length:
Maximum fiber length
=
=
The customer must use the attenuation specified within the manu-
facturer data sheets for accurate calculation of the maximum fiber
length.
ETHERNET SWITCH 10/100BASE-T PORTS
Connector type:
RJ45
MAXIMUM 10 MBPS ETHERNET SEGMENT LENGTHS
Unshielded twisted pair: 100 m (328 ft.)
Shielded twisted pair: 150 m (492 ft.)
MAXIMUM STANDARD FAST ETHERNET SEGMENT LENGTHS
10Base-T (CAT 3, 4, 5 UTP): 100 m (328 ft.)
100Base-TX (CAT 5 UTP):100 m (328 ft.)
Shielded twisted pair: 150 m (492 ft.)
OTHER
TFTP, HTTP, IEC 60870-5-104, Ethernet Global Data (EGD)
P
)
(
)
R MIN
= transmitter output power,
T
) is then calcu-
WORST
×
1.0 dB
=
total insertion loss
OPB
(in dB)
WORST
------------------------------------------------------ -
cable loss (in dB/km)
8 dB
-------------------------- -
2.8km
=
2.8 dB/km
GE Multilin

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