Straight physical contact (PC)
The fiber ends are pressed together in the connector. There is no air gap left to cause reflections. The return
loss is 30 – 55 dB. This is the most common connector type for single mode fibers (e.g. FC/PC, ST, SC/PC, DIN,
HMS, and E2000 connectors).
Slanted (angled) physical contact (APC)
In these connectors, the ends of the fibers are slanted. Again, no air gap is left. This gives the best return loss
(60-80 dB). These connectors are used for high-speed telecom and CATV links (e.g. FC/APC, SC/APC, and
E2000-HRL connectors).
Straight air gap
Inside these connectors is a small air gap between the two fiber ends. Their return loss is less than 14 dB and
the reflection is fairly high. Straight air gap connectors (e.g. ST connectors), are used for multimode fibers.
FC Connector SC Connector ST F Connector
The DS2831 uses the FC/SC/ST replaceable universal
connector interface. Users may replace these with
different connector interfaces, as appropriate for
field applications. (See below.)
NOTE:
If you purchased your DS2831 after July 1
st
,
2016, the default connector type for the OPM
function is SC-APC. VFL is standard with ST-PC.
Replaceable FC/SC/ST universal connector interface
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