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en | Camera Phasing and Accessory Installation
7
Camera Phasing and Accessory Installation
7.1
Camera Phasing Information
NOTE: All cameras should be vertically phased properly with each other. The LTC 8900 system
is an analog switcher, and this is required to prevent rolling during video switching. Keyboard
User Function 44 may simplify camera phasing tasks. Refer to the LTC 8900 Series user
manual for complete details.
7.2
External Sync Information
Installations having cameras powered from an AC phase different than that of the LTC 8900
system may use the built-in EXTERNAL SYNC input or vertical PHASE ADJUST.
The EXTERNAL SYNC input accepts composite video, composite sync, or the output of a
Master Sync generator. If desired, any of the system cameras may be used as a master sync
source to the system using the EXTERNAL SYNC input.
To implement this feature, connect the incoming video source (using a BNC T connector) to
both the appropriate camera BNC input and the EXTERNAL SYNC input on the rear of the LTC
8903 Series video input bay. Any of the LTC 8903 Series bays in the system can be used for
this input. Multiple LTC 8903 Series bays can then be synchronized together by connecting
the V SYNC output from the original bay to the EXT. SYNC input of the next bay. Continue
looping the sync signals in this manner until all LTC 8903 Series bays are synchronized.
It is not necessary to connect a sync source to LTC 8902 video output bays. The LTC 8902
Series video output bays automatically become synchronized when a LTC 8903 Series bay is
connected to it via ribbon cable to its A1 connector. Alternatively, the PHASE ADJ on the front
panel of the power supply may be adjusted on the original LTC 8903 Series bay until vertical
interval switching is achieved. The PHASE ADJUST has a range of about 130 degrees.
If no external sync signal is used, the matrix bays automatically use the AC power to generate
an internal sync signal.
The EXT SYNC LED on the front panel of the power supply inside a matrix bay illuminates
whenever the bay is receiving an external sync signal. For LTC 8902 Series video output bays,
this is whenever a ribbon cable is connected to its A1 connector.
7.3
System Keyboard Installation
Connect a maximum of 8 system keyboards to any of the 8 keyboard ports (modular phone
type jacks) on the rear of the LTC 8900 Series CPU bay. Each keyboard is supplied with a 3 m
(10 ft) cable for local hookups. The LTC 8900 Series CPU bay can provide power to keyboards
up to 30 m (100 ft) away using the optional LTC 8558/00 hookup cable. For distances of up to
1.5 km (5000 ft), the optional LTC 8557/x0 Hookup Kit is required, which is supplied with a
remote power pack and requires user-supplied shielded twisted pair (Belden 9841 or
equivalent) for communication.
Note that the system contains 64 levels of user priority which can affect operator access to
various system features. These priority levels can be changed via the PC-based configuration
software, but as a factory default, keyboard port number 1 is assigned the highest level. For
the other keyboard default assignments, refer to the User Information section of the system s
User Manual.
The system can accommodate an additional 56 system keyboards using external LTC 8714/x0
and LTC 8715/x0 keyboard port expander accessory units. Instructions for these accessories
are included with the port expander units.
2015.01 | 10.6 |
Installation Manual
LTC 8900 Series
Bosch Security Systems, Inc.
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