FDDI Connection Information
B–3
B.2 FDDI Connector Keying
The DECbridge 500/600 series uses the following FDDI connector types:
•
Media Interface Connectors (MIC) for multimode type connections
•
FC/PC for single-mode type connections
The MICs are designed to align the fiber cable properly with the transmit and receive
optics — that is, they are keyed and must be aligned properly. DAS versions of the
bridge use MIC A and MIC B type connectors to connect the bridge to the dual ring.
SAS versions of the bridge use a single MIC S connector to connect to a concentrator
(see Figure B–2).
Figure B–2: FDDI Connector Keying
A
B
A
B
M
S
M
S
LKG–5072–90I
Connector keying:
MIC A Primary in/secondary out–DAS A port
MIC B Primary out/secondary in–DAS B port
MIC M Concentrator M port
MIC S SAS S port
The position of the keyway on the MIC plug determines the type of receptacle to
which it connects. A MIC S plug fits all receptacles. The other MIC plugs and recep-
tacles (type A and B) must match for proper installation.
The FC/PC single-mode connectors are not keyed but are identified by transmit
(
) and receive (
) icons.
