Installation Manual

Termination Practices
Video from every camera should be terminated with a 75 ohm resistance. Each video line
should be terminated exactly once. If video from a camera is going to several devices, only the
last piece of equipment on the video line should be terminated.
See , page 68 through , page 68 for proper termination practices. Allegiant LTC 8900
systems terminate their video inputs as follows:
LTC 8903 Series Terminations
Each LTC 8921/00 VIM card has DIP switches (S1001 through S1004) for selecting the
termination of each video line. To terminate an input line, make sure that the appropriate DIP
switch on the VIM card is ON. If non-terminated operation is required for looping purposes,
turn the switch OFF.
Each LTC 8921/00 VIM card provides outputs for 32 monitors. The LTC 8903 Series bay
provides 64 outputs, two LTC 8921/00 VIM cards for each 32 inputs (when more than 32
monitors are being served by the LTC 8903 Series bay). In this case, inputs are shared by
adjacent cards. The cards in slots one and two handle inputs 1-32, the cards in slots three and
four handle inputs 33-64, etc,. Since each input goes to two cards, only one of the two cards
should be terminated. Although either card in a pair can be terminated, it is recommended
that cards in the odd number slots are terminated (dip switches ON), and cards in even
numbered slots are unterminated.
The LTC 8903 Series Input Bay provides video looping connections which use LTC 8809/00
coax type ribbon cables. Each LTC 8809/00 cable provides looping capability for up to 16
video inputs. The termination switches on the LTC 8921/00 cards should be OFF for all LTC
8903 Series Input bays except those in the last set (assuming the system will NOT have video
looping connections). In the last bay, the termination switches should be set to ON in even
numbered slots (as described in the preceding paragraph).
If the system will have some or all video inputs looped out, all termination switches
corresponding to the looped video channels should be set to OFF in all LTC 8903 Series bays.
Second Level LTC 8903 Series Terminations
When more than 1024 cameras are used, two levels of LTC 8903 Series bays are required. In
this case the LTC 8903 Series bays in the first level are terminated as described above. In the
second level LTC 8903 Series bay, the termination switches should be turned ON on all cards.
Note that in the secondary level, LTC 8903 Series cards are inserted only into slots 1, 4, 5, 8,
9, 12, 13, and 16 as depicted in , page 68 through , page 68, , page 68, and , page 68.
LTC 8902 Series Terminators
Dip switches S1002, S1003, S1004, and S1005 on the LTC 8934/00 Video Output Module are
video termination switches. All of these switches should be set to ON (terminated). This
factory default correctly terminates the outputs of the LTC 8903 Series bays into a 75 ohm
load.
Just like camera inputs, monitor outputs on the Allegiant system are designed to be
terminated. Each monitor output from the LTC 8902 Series bay expects to be connected to a
75 ohm load. This is the load typically provided by a normal monitor. If a monitor output line is
looped through several monitors or other equipment, make sure that only the last unit on the
line is terminated.
5.12
5.12.1
5.12.2
5.12.3
30
en | Hardware Installation Procedure for Standard Systems Utilizing LTC 8904 Series
CPU
LTC 8900 Series
2016.04 | 10.7 | F.01U.323.096 Installation Manual Bosch Security Systems, Inc.