Westermo ODW-720-F2 - Manual (Page 33)

33 6651-2235
About the interfaces
Power terminal
The power terminal has two independent inputs, +VA and +VB, allowing redundancy
should either fail. The ODW-720 power supply is galvanically isolated from all other
internal electronics.
Optical fibre interfaces
ODW-720 uses Small From Factor Pluggable (SFP) transceivers that are in compliance
with the Multi-Sourcing Agreement (MSA). This means that a wide range of different fibre
tranceivers and connectors can be used.
RS-232 interface
The RS-232 interface is a female 9-position D-sub. Pin assignments are compliance with
the EIA RS-232 standard.
Status port
The status port connects to an internal relay wich may be used to trigger an external
alarm if a fault condition occurs. During normal operation pins 1 and 2 are in contact
with each other, and pins 2 and 3 are isolated. During an optical link failure, or power
failure, pins 1 and 2 are isolated, and pins 2 and 3 are in contact with each other.
Optical link failures can be classified in to two categories, local or remote, as indicated by
the FL L and FL R LED’s. A local link failure is when an optical link is down at this
particular unit. A remote link failure is when an optical link is down at some other unit.
From the factory, the status port is set to trigger on both types of link failures.
However, by setting DIP-switch S2:6 to the ON position, the status port will only
trigger when a local link failure has occured.