Nevion UDC-3G-XMUX4+ - Manual (Page 12)

UDC-3G-XMUX4+ Rev. C
nevion.com | 12
The backplane for the UDC-3G-XMUX4 is labelled UDC-3G-XMUX4-C1. It is designed to be
fitted in a Flashlink rack unit and to take up a single slot. The connection side will face
outward on the back side of the Flashlink rack when mounted correctly. The table below is an
overview of the connectors and their associated functions.
Function Label Connector type
HD/SD-SDI input IN BNC
HD/SD-SDI output 1 1 BNC
HD/SD-SDI output 1 inverted _
1 BNC
HD/SD-SDI output 2 2 BNC
HD/SD-SDI output 2 inverted _
2 BNC
Black & Burst/ tri-level frequency
reference input SYNC BNC
AES I/O 1 1 WECO
AES I/O 2 2 WECO
AES I/O 3 3 WECO
AES I/O 4 4 WECO
GPI in GPI/DATA TP45, pin 2, 3, 6 & 7
GPI out GPI/DATA TP45 pin 1 (pin 8 = GND)
DATA out GPI/DATA TP45 pin 4 & 5
Table 3: Connector functions
Unused SDI inputs/outputs should be terminated with 75 Ohm.
2.2.1 Sync input
The main module features a slide switch to select between sync taken from the backplane
input (switch position marked “BP”) and a frame-distributed sync (switch position marked
“RACK”). At the time of writing this manual no frame-distributed sync is available, and the
sw
itch should be kept in the “BP” position.
The backplane also features a switch on the component side (the side facing into the frame).
This is a switchable termination for the backplane sync input. By setting the slide switch in
Figure 9 to
the “ON” position, the sync input will be terminated to 75 Ohm. Generally, the
sync inputs should be terminated if each sync input is fed from a separate output of a
distribution amplifier. If one sync output is passively split and fed to several modules
(T-connectors) one module should be terminated while the others should be left
unterminated.
If the module will be used without a frequency reference the positions of these slide switches
do not matter.
2.2.2 GPI outputs (alarms)
The UDC-3G-XMUX4 has one GPI output. This reflects the general status of the card, and
thereby acts as an all-purpose alarm. See Table 4 below.
2.2.3 GPI inputs
The UDC-3G-XMUX4 has four GPI inputs. Together they form a four-bit number (16
combinations) that can be used to select one of the many conversions that the module can
perform., either as the fallback conversion for when the automatic logic lacks the necessary
input information to make a decision, or a completely manually selected conversion. This is
the subject of chapter 3.6, and section 3.6.7 in particular. See Table 4 below for the location
of the GPI inputs.