Cabletron Systems 100BASE-FX, Руководство по кабельной продукции

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Connector Types 9-11
Token Ring Media
DB9
The DB9 connector is a smaller standard connector for IEEE 802.5 networking
applications, typically used for desktop and networking hardware connections. It
is used in locations where a sturdy connection to STP cabling is required, but the
use of MIC connectors is either impossible or undesirable. The DB9 cabling is
usable on all types of STP cabling, but is most commonly found on jumper cabling
such as IBM Types 6 and 9.
The DB9 connector is a metal or composite shell with nine pins or channels at the
end of the connector, arranged in two staggered rows. The pins are numbered
from one to nine, beginning with the upper row of five pins or channels, that are
numbered one to five, starting from the far right pin. The lower four pins are
numbered from six to nine, beginning also at the far right. The arrangement of
pins in the DB9 connector is shown in Figure 9-5, below.
Figure 9-5. DB9 Pin Arrangement
The male DB9 connector housing, or shell, also incorporates two securing screws.
These screws are used to secure the DB9 connector to a female DB9 connector and
hold it in place. The screws of a DB9 connector should always be used to ensure a
solid connection between two connectors, otherwise, disconnection of the cable or
damage to the connectors may result.
NOTE
The DB9 connector looks identical to the PC EGA monitor
connector. If a Token Ring lobe connection is attached to the
monitor port, the Token Ring network will enter an error state.
This is due to the resemblance that EGA monitor current has to
the phantom current required to open a Token Ring lobe
connection.
6 7 8 9
1 2 3 4 5
Pin Ordering
1845n24