Grass Valley LDK 4410 - Manual (Page 17)

LDK 4410 + LDK 5420 3G Fiber Transmission System User’s Guide (v1.0) 17
Chapter 2 - Base station
Dry contact
☞
Note
☞
Note
A common return (not ground!) can be used for all three functions (ISO, On Air and Call)
If a contact is closed, the corresponding function is Active or Inactive, depending on the
selection the
SYSTEM > SIGNALLING menu:
Dry contact with multiple base stations
This is an example of an On Air signalling with multiple base stations using a common contact.
ISO 1a
ISO 1b
On-Air (Tally) 1a
On-Air (Tally) 1b
Call 1a
Call 1b
ISO in ext. send (pin 3)
ISO in ext. return (pin 11)
On-Air in ext. (pin 4)
On-Air in ext. return (pin 12)
Call in ext. (pin 5)
Call in ext. return (pin 13)
External ISO signalling
(dry contact)
External On-Air signalling
(dry contact)
External Call signalling
(dry contact)
Menu setting Input is shorted: Input is open:
LH (low-high) Function is Active Function is Inactive
HL (high-low) Function is Inactive Function is Active
On-Air (Tally) 1
On-Air (Tally) 2
On-Air (Tally) n
Common
External On-Air signalling
(common contact)
On-Air in ext. send (pin 4) Signalling connector
On-Air in ext. return (pin 12) Base Station 1
Signalling connector
Base Station 2
Signalling connector
Base Station n
On-Air in ext. send (pin 4)
On-Air in ext. return (pin 12)
On-Air in ext. send (pin 4)
On-Air in ext. return (pin 12)