Cabletron Systems 100BASE-FX, Cabling Manual

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Token Ring Media
9-12 Connector Types
The DB9 connector does not perform a wrap on disconnect as does the larger MIC
connector. There is no internal mechanism for performing these operations.
Stations connected to networking hardware with DB9 connectors rely on the
networking hub to perform any wrapping in the event of a disconnection or cable
error.
STP wires that are connected to a DB9 cable must be set up in the fashion detailed
below:
RJ45
The shielded RJ45 connector used with STP cable is identical in shape to the
standard RJ45 connector used in other network applications such as Ethernet and
FDDI TP-PMD. The difference between the shielded RJ45 and the standard RJ45 is
the addition of a metal shielding ground to the plastic housing of the RJ45
connector. This shield is connected to the braided outermost shield of the STP
cable.
The connector itself is a rectangular keyed connector with a locking clip. The RJ45
connector can only be inserted into an RJ45 port in its proper alignment, and,
when inserted, will lock into place. Due to the lighter construction characteristics
of the RJ45 connector in comparison with the other STP cable connectors, care
should be taken to ensure that the strain placed on an RJ45 connection is
minimized through proper use of cable management hardware.
Table 9-3. IEEE 802.5 DB9 Pinouts
STP Wire
Color
IEEE 802.5
Signal
DB9 Pinout
Black TX - 1
Green RX - 5
Orange TX + 6
Red RX + 9