Special Programming For "Cascaded" Satellite System Configurations - Bosch LTC 8500 Instruction Manual

9.6 Special Programming for "Cascaded" Satellite System
Configurations

Special Programming for "Cascaded" Satellite System Configurations

In a 3-tier cascaded satellite system, it is highly recommended for the system design
to have more trunks lines between the intermediate master/satellite system and the
3rd level satellite system than there are between the top level master system and the
intermediate system. In systems where this is not the case, it is likely that operators
at top level master and the intermediate master/satellite will end up fighting for
trunk lines coming from the 3rd level satellite system.
There are two user configuration options available (starting in CPU firmware ver-
sion 8.70) to eliminate or at least significantly reduce conflicts between operators
when this type of system is being used.
Option 1: Using Factory default settings, previously selected satellite cameras
remain on trunk lines even after the operator switches back to a local camera view.
Although this mode of operation is more desirable in standard systems because it
minimizes delays when previous satellite cameras are reselected, it is not advanta-
geous to use in cascaded systems. In cascaded systems, all available trunk lines com-
ing from the 3rd level satellite system may become used up, making them
unavailable to the operators at the intermediate system.
In this situation, keyboard User Function 41 should be set to the NO REM CAM
CACHE option at the master site location. In this mode, after the top level operator
selects a locally connected camera, the trunk line between the top level and the
intermediate level system will immediately be reset to its Start-up camera (as
defined in the Monitor Table of the LTC 8059/00 MCS). This action frees the trunk
line between the intermediate level system and the 3rd level system so it will be
available if needed by an operator at the intermediate level system.
For the monitors being used as trunk lines in the intermediate system, it is
important for the "Start-up" camera numbers listed in the Monitor Table of the
LTC 8059/00 software to be programmed to specify cameras connected locally or a
local unused input (i.e., the raster generator will be displayed when called up). This
action ensures that no trunk line is used when a monitor switches to the Start-up
camera.
Option 2: If the top level master system and intermediate level system in a cascade
configuration can or will be set to operate as "Dual Master" systems, a priority based
satellite camera feature can be configured.
In default cascaded satellite system configurations, satellite switching commands are
not associated with a user priority level. When a switching command sent from a
master site is received by a satellite, the switch selection can immediately be overrid-
den by operators at the satellite location who have any priority level. This situation
is more likely to be encountered in 3-tier Satellite systems that do not have a good
distribution of trunk lines (i.e., more between the top level system and the interme-
diate level system than there are between the intermediate system and the 3rd tier
satellite).
Since dual master configurations support bi-directional communications, it is possi-
ble to set keyboard User Function 41 to use the SAT nnn PRIORITY option for both
the top level and intermediate level master systems. The satellite number assigned
to the system that is currently being programmed must be specified here. This fea-
ture will enable use of the operator's user priority to determine if access to a desired
satellite camera is provided or not. For instance, if no trunk lines are available and
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