Grass Valley Adder II - Manual (Page 16)

12
Setting Up an Adder II System
Coaxial Connections
Fig. 2-5: Link LOCK Status LEDs
If the switch is on the REMOTE position and the frame on the other side of the link is not
locked, the display will indicate NoLk.
Coaxial Connections
Figure 2-2 above shows the position of the COAXIAL I/O (labeled 75/125 MBPS) on the rear
panel of the Base. As an alternative to using fiber, the Adder II system can support full
operation on two coaxial cables of up to 300m (1000 ft) in length.
When not linked, the system looks for an active link on the fiber and COAX ports. In this way
(and unlike previous Adder versions), the coax canserve as a redundant path in conjunction
with one or both of the optical paths.
Connection is simply a 75 Ohm coaxial cable from the OUT on each frame to the IN on the
other.
The COAX ports are also used (the Adder II must in 75 Mbps mode) when paired with bi-
directional DiamondBack II’s or DiamondBack 4x4’s. See
Legacy Systems on page 26 for
more information.
Other Display messages
A fiber or coax break (depending on configuration) or loss of signal from one end of the link
to the other will result in the message Communication Lost.
The message Illegal configuration or loopback will appear if you pair two chassis that
have a TX module in one chassis for which there is no corresponding RX module in the
other.This message will also appear if you loop back the fiber or coax so that the chassis is
talking to itself. The message goes away as soon as you press any button.