K3 1RU AB Switch Page 17
SW'D COM
FG ISO
1A
1B
1COM
Shown In Factory Default:
Ground Switched & Isolated
A/B Switch Modules The K3 Rack Mount AB Switching System can be factory configured with up to 3 AB switches of any of
the following interfaces plus one control interface and power supply configuration. Some switch
interfaces occupy 2 slots – SW1 & SW2
Frame Ground Switching
(D9, 15 and 25 model Only)
Jumper selection allows Pin 1 Frame
Ground to be either switched or tied
together and unswitched. Pin 1 can also
be tied to the Frame of the Chassis, or left
isolated from the chassis.
Signal Ground Switching
(D9, 15 and 25 model Only)
An additional set of jumpers provides the
same switched/common, isolated or grounded for Signal Ground. These jumpers control Pin 7 in the
D25 model and Pin 5 in the D15 and D9 models. The circuit is the same as shown above replacing Pin
1 for the correct pin and SG Signal Ground for FG, Frame Ground
Signal Ground Switching
An additional set of jumpers provides the same switched/common, isolated or grounded for Signal
Ground. These jumpers control Pin 7 in the D25 model and Pin 5 in the D15 and D9 models. The circuit
is the same as shown above replacing Pin 1 for the correct pin and SG Signal Ground for FG, Frame
Ground.
Indicators
Two Red LEDs indicate Switch status A or B. LED's are driven by extra relay contacts.
Manual Switches
Manual toggle switch on each card. These are momentary switches.
Relays
Sealed Telephone relays. Gold clad contacts. Maximum Contact Current: 2 Amps @ 30 VDC
Special DS-3 module: Hi Freq. 45 Mhz, 55db Isolation.