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2–6 • Installation DFR-8110A(-C) User Manual (Iss. 03)
Cabling for the DFR-8110A(-C)
This section provides information for connecting cables to the DFR-8110A(-C).
Cabling Overview
The frame BNC connectors have been marked as inputs and outputs. In some cases, the
connectors will have been assigned a different function. Consult the installation section of each
module, or BNC designations screened on the card, for a translation table, if required.
The inputs are internally terminated in 75 ohms.
Figure 2.3 DFR-8110A(-C) and DFR-8110A(-C)-C Rear Panel View
Aux A Connector
The Aux A telco connector may be wired to an external alarm system for reporting alarms in
SMPTE 269M format. For more details on this type of system, refer to the document
ANSI/SMPTE 269M - 1994 , available from SMPTE.
Some modules have provision for reporting signal loss and certain other fault conditions. All such
cards in the frame connect to an opto-isolator circuit in the frame.
For example, in the case of the SRA-8001A Serial Auto-Reclocking Amplifier, if the input signal
is lost or low, the INPUT STATUS Red LED will be lit. If the FAULT REPORT jumper is in the
ENABLE position, then there will be a pulsed contact closure on the telco connector for as long
as the error condition continues. The output circuit will be closed for about 1-2 milliseconds,
repeated approximately every 17 milliseconds. In the absence of a fault, the output will remain
open.
The circuit can drive a 20mA alarm load.
Figure 2.4 SMPTE 269M Alarm Reporting Internal Interface and Typical Connections
Aux B Connector
This BNC connector is used to relay data to an external monitoring system. Serial data
communication is used. Only modules having this capability will use this system.
1
2
3
4
5
6
Frame
AUX A
Jack (J15)
1
2
5
4
From
All
Modules
U1
MOC8101 TV
+6.7V
–6.7V
R7
100K
Q2
2N6427
C11
100n
Internal Interface Circuit
POWER
SUPPLY
(24 Volts max.)
1
2
3
4
5
6
Mating
Telco
Plug
ALARM
CIRCUIT
(20mA max.)
– +
–
+
Customer Supplied Alarm