Physical Channel Summary - Polycom SoundStructure C16 Design Manual

Example of SoundStructure Devices OBAM Linked Out of Order
16
IN OUT
OBAM
16
IN OUT
OBAM
16
C
IN OUT
OBAM
The organization of the devices in this example would make it confusing to properly terminate inputs and
outputs to the desired physical inputs and outputs. Any OBAM linking scheme other than the out-to-in,
top-to-bottom system, is not recommended as it can increase system debug and installation time.
Local and System Numbering for SoundStructure Devices OBAM Linked Out of Order
Device Local Numbering
A 1 - 16
B 1 - 16
C 1 - 16
Due to this possible confusion of the numbering of physical inputs and outputs, always connect the devices
as recommended in the top-down order connecting the higher OBAM OUT connection to the next OBAM
IN connection.

Physical Channel Summary

Physical channels and the OBAM Link were introduced in the previous section as a simplification of how to
refer to the actual physical inputs and outputs when multiple SoundStructure devices are used. By OBAM
Linking multiple SoundStructure devices in an OBAM out-to-OBAM-in fashion from top to bottom, the
physical channel numbers in a multi-unit installation are sequential from 1 to the maximum number of inputs
and outputs in the system. No longer is a specific device identification required to uniquely identify which
input "1" is meant when there are multiple devices. When multiple SoundStructure devices are used, there
is only one input "1" and it corresponds to the first input on the top device. The first input on the second
device is input 17 (if the first device is a SoundStructure C16).
In the next section, the concept of physical channels is extended as the new concept of virtual channels is
introduced as a way to easily and more flexibly reference the physical input and output channels, simplifying
both SoundStructure device setup and how SoundStructure devices are controlled with external control
systems.
Polycom, Inc.
16
A
16
16
16
B
16
16
System Numbering
1 - 16
33 - 48
17 - 32
1
16
A
16
33
16
B
48
16 17
C
32
1
A
16
33
B
48
17
C
32
55