22
FRADSWITCH A/S 3 PORT
3.5.3 C
ONNECTING TO THE
N
ON
-DDS M
AIN
-L
INK
P
ORTS
You can always use straight-through cables for these connections if you set the
FradSwitch A/S 3 Port’s interface-board DTE/DCE jumpers correctly (see
Section 3.3.3
). (On X.21 models, the X.21 DCE jumpers also need to be set
correctly—see
Section 3.3.2
.) Beyond this, the type of cable you connect depends
on the link-port’s interface:
• How you connect an
RS-232
device to a Switch’s RS-232 main-link port will
depend on what type of connector the device has. If it’s a DB25 male or
female, run a shielded straight-through-pinned RS-232 cable—such as our
EDN25C-MF or EDN25C-MM respectively—between the Switch port and the
device. If the device’s connector is a DB9 male—as will be the case if you are
attaching a terminal-emulating PC to upgrade the Switch’s software (see
Section 4.3
)—run a PC/AT modem cable such as our EVMBMC between the
Switch port and the device. (Be aware that devices with normal DB9 RS-232
connectors, pinned as TIA-574, must communicate asynchronously with the
Switch. This is because the standard TIA-574 pinout does not include the sync
clocking signals present on the full RS-232 DB25 pinout.)
• To connect an
RS-530
device to a Switch’s RS-530 main-link port, run a
shielded straight-through-pinned RS-530 cable—such as our EVN530-MM—
between the Switch port and the device.
• To connect a
V.35
device to a Switch’s V.35 port, attach the included DB25
male to M/34 female adapter cable to the port. Then run a run a shielded
straight-through-pinned V.35 cable—such as our EYN450-MM—between the
M/34 end of the adapter cable and the device.
• To connect an
X.21
device to a Switch’s X.21 main-link port, attach the
included DB25 male to DB15 female adapter cable to the port. Then run a
shielded straight-through-pinned X.21 cable—such as our EGM16E-MM—
between the DB15 end of the adapter cable and the device.
NOTE
The cables you attach to the FradSwitch A/S 3 Port should be shielded,
in order to comply with FCC rules. The Switch and its data interfaces
will work well even if the cables are not shielded, but some radio
interference may occur.
