Westermo ODW-610-F2 - Manual (Page 14)

14 6651-22611
Optical Power Budget
The maximum supported link lengths as specified in the table above should only been
seen as indicative. The allowed link length is calculated from the Optical Power Budget
(OPB), (the available optical power for a fibre-optic link), and the attenuation of the fibre,
comprising losses due to in-line connectors, splices, optical switches and a margin for link
aging (typical 1.5 dB for 1300 nm).
The worst-case Optical Power Budget (OPB) in dB for a fibre-optic link is determined
by the difference between the minimum transmitter output optical power and the lowest
receiver sensitivity.
* Output power is power coupled into a 62.5/125 µm multimode fibre.
** Output power is power coupled into a 9/125 µm singlemode fibre.
*** The optical power should be reduced by at least 5 dB (SM-LC80)
or 3dB (SM-LC80) between the optical output and input.
FX (Fibre) SM-LC80 SM-LC40 SM-LC15 MM-LC2
Fibre connector LC duplex LC duplex LC duplex LC duplex
Fibre type Singlemode
9/125 µm
Singlemode
9/125 µm
Singlemode
9/125 µm
Multimode
62.5/125 and
50/125 µm
Wavelength 1550 nm 1310 nm 1310 nm 1310 nm
Transmitter
Output optical power min/max –5/0 dBm
**
–5/0 dBm
**
–15/–8 dBm
**
–20/–14 dBm
*
Receiver
Input sensitivity –34 dBm
(max)
–34 dBm
(max)
–31 dBm
(max)
–31 dBm
(max)
Receiver
Input optical power Maximum –5 dBm
(min) ***
–3 dBm
(min) ***
–8 dBm
(min)
–8 dBm
(min)
Optical power budget, worst case 29 dB 29 dB 16 dB 11 dB
Bit error rate (BER) <1 x 10 –10 <1 x 10 –10 <1 x 10 –10 <2.5 x 10 –10
Transceiver type Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class Class 1, IEC 825-1 Accessible Emission Limit (AEL)
PROFIBUS DP (RS-485)
Electrical specification EIA RS-485 / EN 50 170
Data rate 9 600 bit/s, 19.2, 93.75, 187.5, 500 kbit/s, 1.5, 3, 6 and 12 Mbit/s
Data format 8 data bits, even parity, 1 stop bit, 11 bits total
Protocol PROFIBUS DP / EN 50170
Data Rate detection Yes, compliant with EN 50 170
Retiming Yes
Turn around time In accordance with EN 50 170
Transmission range ≤ 1200 m, depending on data rate and cable type (EIA RS-485)
Settings None, external termination and failsafe biasing
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Power and Status port
Connection 9-pin D-sub female
Shielded cable Not required
Conductive housing Isolated to all other circuits and housings