Cabletron Systems 100BASE-FX, Cabling Manual

Page: 127 / 192

Connector Types 11-13
FDDI Media
An STP cable that uses solid core wires requires the use of contact blades with
three teeth. This is due to the inability of the teeth to effectively penetrate the solid
core of the STP wire without damaging the cable. The three teeth are placed in a
staggered left-right-left orientation that pierces the insulator of the STP wire and
wedges the core between the teeth, making an electrical contact at three points.
The wires of the STP cable must be organized in the RJ45 connector properly,
based upon the USOC specification and the ANSI X3T9.5 specification. The
proper arrangement of the wires in the RJ45 connector are given in Table 11-2,
below. In addition to arranging the cables properly, the braided shield of the STP
cable must be connected to the metal shield of the RJ45 connector.
Fiber Optics
FDDI MIC
The FDDI Media Interface Connector, not to be confused with the Token Ring
Medium Interface Connector, is a gendered connector that is used with all fiber
optic cabling for FDDI networks meeting the MMF-PMD and SMF-PMD
standards. It consists of a plastic housing that separates the strands of a
two-strand fiber optic cable and a set of ferrules that provide the physical point of
connection for the fibers.
NOTE
The type of STP cable required by FDDI TP-PMD networking
equipment is constructed with solid core wires only. Do not use
RJ45 connectors with contact blades designed for stranded
cable.
Table 11-2. FDDI TP-PMD Pinouts for STP
Wire Color
IEEE 802.5
Signal
RJ45 Pinout
Black TX - 3
Red RX + 4
Green RX - 5
Orange TX + 6