Communications; Inter-Relay Communications - GE T35 Instruction Manual

2.2 SPECIFICATIONS
RS232
Front port:
RS485
1 or 2 rear ports:
2
Typical distance:
Isolation:
SHIELDED TWISTED-PAIR INTERFACE OPTIONS
INTERFACE TYPE
RS422
G.703
RS422 distance is based on transmitter power
and does not take into consideration the clock
NOTE
source provided by the user.
LINK POWER BUDGET
EMITTER, TRANSMIT
FIBER TYPE POWER
820 nm LED, –20 dBm
Multimode
1300 nm LED, –21 dBm
Multimode
1300 nm ELED, –21 dBm
Singlemode
1300 nm Laser, –1 dBm
Singlemode
1550 nm Laser, +5 dBm
Singlemode
These Power Budgets are calculated from the
manufacturer's worst-case transmitter power
NOTE
and worst case receiver sensitivity.
MAXIMUM OPTICAL INPUT POWER
EMITTER, FIBER TYPE
820 nm LED, Multimode
1300 nm LED, Multimode
1300 nm ELED, Singlemode
1300 nm Laser, Singlemode
1550 nm Laser, Singlemode
2-10
®
19.2 kbps, Modbus RTU
®
Up to 115 kbps, Modbus RTU, isolated
together at 36 Vpk
1200 m
2 kV
TYPICAL DISTANCE
1200 m
100 m
RECEIVED POWER
SENSITIVITY BUDGET
–30 dBm 10 dB
–30 dBm 9 dB
–30 dBm 9 dB
–30 dBm 29 dB
–30 dBm 35 dB
MAX. OPTICAL
INPUT POWER
–7.6 dBm
–11 dBm
–14 dBm
–14 dBm
–14 dBm
T35 Transformer Management Relay
2 PRODUCT DESCRIPTION
ETHERNET PORT
10Base-F: 820 nm, multi-mode, supports half-
duplex/full-duplex fiber optic with ST
connector
Redundant 10Base-F: 820 nm, multi-mode, half-duplex/full-
duplex fiber optic with ST connector
10Base-T: RJ45 connector
Power budget: 10 db
Max optical input power: –7.6 dBm
Max optical output power: –20 dBm
Receiver sensitivity: –30 dBm
Typical distance: 1.65 km
SNTP clock synchronization error: <10 ms (typical)

2.2.9 INTER-RELAY COMMUNICATIONS

TYPICAL LINK DISTANCE
EMITTER TYPE FIBER TYPE CONNECTOR
820 nm LED Multimode
1300 nm LED Multimode
1300 nm ELED Singlemode
1300 nm Laser Singlemode
1550 nm Laser Singlemode
Typical distances listed are based on the fol-
lowing assumptions for system loss. As
actual losses will vary from one installation to
NOTE
another, the distance covered by your system
may vary.
CONNECTOR LOSSES (TOTAL OF BOTH ENDS)
ST connector 2 dB
FIBER LOSSES
820 nm multimode 3 dB/km
1300 nm multimode 1 dB/km
1300 nm singlemode 0.35 dB/km
1550 nm singlemode 0.25 dB/km
Splice losses: One splice every 2 km,
at 0.05 dB loss per splice.
SYSTEM MARGIN
3 dB additional loss added to calculations to compensate for
all other losses.
Compensated difference in transmitting and receiving (channel
asymmetry) channel delays using GPS satellite clock: 10 ms

2.2.8 COMMUNICATIONS

TYPICAL
TYPE DISTANCE
ST 1.65 km
ST 3.8 km
ST 11.4 km
ST 64 km
ST 105 km
GE Multilin