7807Lt-2 Connections - evertz MultiFrame 7700 Manual

7700/7800 MultiFrame Manual
7807LT-2 Dual Wideband RF Fiber Transmitter
2.1.

7807LT-2 CONNECTIONS

FIBER OUTPUTS: SC/UPC, SC/APC, FC/UPC, FC/APC or ST/UPC female connectors with the optical
outputs from the 7807LT-2. These connectors should be connected to the FIBER
IN connectors of an appropriate Evertz companion receiver model at the destination
end with suitable fiber optic cables. The 7807LT-2 may transmit 1310nm, 1550nm
or CWDM wavelengths as indicated by the part number on the card ejector. The
standard connector type is UPC. This connector type is compatible with standard
PC connectors, but for optimal return loss performance, Evertz recommends the
use of UPC fiber terminations throughout the system. The optional APC connectors
provide further enhanced return loss performance, and when specified, should be
used throughout the system.
RF IN: Input connectors for RF signals. These connectors can also provide LNB power
and 22 kHz tone back to the LNB.
RF OUT: Output connector provides buffered copy of the incoming RF signal for monitoring
purposes (signal peaking, etc.) or coaxial distribution. Although not essential, if this
connector is to remain unused, it is recommended that it be terminated with an
appropriate 75 Ohm or 50 Ohm load.
GPO's: The 3 pin terminal strip is used for the General Purpose Outputs (GPO). Pin1 and
Pin2 refer to GPO1 and GPO2 respectively, whose behavior (NC/NO) can be
selected by a jumper. (Refer to section 5.1 for Jumper Positions). Signal on GPO
Common (C) is to be provided by the user. A minor alarm between Common and
GPO1 is triggered in a state of RF outside of threshold and major alarm between
Common and GPO2 is triggered in a state of Laser failure and/or LNB short. Each
GPO output is a set of normally open and normally closed relay contacts as shown
in Figure 2-2.
When connecting cables to the GPO terminal block, a ferrite core should be placed

around the cable in order to reduce the electromagnetic interference to limits
acceptable for Class A digital devices. The ferrite impedance should be greater
than 70 ohms at 25MHz and greater than 135 ohms at 100MHz.
Page - 4
NO GPO Contact
NC GPO Contact
GPO Common
Figure 2-2: GPO Configuration
Revision 1.2
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internal
circuit