Westermo ODW-622 - Manual (Page 14)

14 6650-2234
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 mm
Singlemode
9/125 mm
Singlemode
9/125 mm
Multimode,
62.5/125 and
50/125 mm
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, max –34 dBm –34 dBm –31 dBm –31 dBm
Receiver
Input optical power, max –5 dBm*** –3 dBm*** –8 dBm –8 dBm
Optical power budget,
worst-case 29 dB 29 dB 16 dB 11 dB
Transceiver type Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class Class 1, IEC 825-1 Accessible Emission Limit (AEL)
* To minimise the risk of interference, a shielded cable is recommended when the cable is located inside 3 m
boundary to the rails and connected to this port.
The cable shield should be properly connected (360°) to an earthing point within 1 m from this port.
This earthing point should have a low impedance connection to the conductive enclosure of the apparatus
cabinet, or similar, where the unit is built-in. This conductive enclosure should be connected to the earthing
system of an installation and may be directly connected to the protective earth.
* Output power is power coupled into a 62.5/125 mm multimode fibre
** Output power is power coupled into a 9/125 mm singlemode fibre
*** The optical power should be reduced by at least 5 dB (SM-LC80 and Bi-di LC-60) or 3dB (SM-LC-40
and Bi-di LC-40) between the optical output and input.
RS-232
Electrical specification EIA RS-232
Data rate 300 bit/s – 250 kbit/s
Data format 9 – 12 bits. Only needed in redundant ring
Protocol Start-bit followed by 8 – 11 bits
Retiming Yes
Transmission range 15 m
Isolation to Status and Power port
Connection 9-pin D-sub female (DCE)
Shielded cable Not required, except when installed in railway applications as
signalling and telecommunications apparatus and located close
to rails*
Conductive housing Isolated to all other circuits and housings
Optical Power Budget
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 ageing (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 differ-
ence between the transmitter’s output optical power (min) and the receiver input sensitivity (max).