Operational Example; Requirements For Bandwidth-On-Demand And Dmesh With Shod (Single Hop On Demand; Dmesh Operation - Comtec CDM-840 Installation And Operation Manual

CDM-840 Remote Router
Appendix L
L.3

Operational Example

L.3.1 Requirements for Bandwidth-on-Demand and dMesh with SHOD
(Single Hop on Demand)
For any dynamic switch to occur, you need to adhere to some minimum requirements:
•
Your active network is an Advanced VSAT Network platform Version 1.5.2.1 or greater
running a Vipersat Management System (e.g., VMS Version 3.12.x).
•
Space segment in the shared dSCPC bandwidth pool must be available.
•
CDD-880 Expansion Units must be available at the hub site and each AVSAT remote site.
o The hub site and remote site must be equipped identically. You may populate each
CDD-880 1RU chassis with up to 12 demodulators – two demodulators per card, up to
six cards per unit. This provides a maximum of 12 point-to-multipoint dynamic mesh
circuits between remote sites (assuming each remote site is equipped with a fully
populated CDD-880).
o If more circuits are needed, you simply add more CDD-880s at the AVSAT remote sites
and at the hub location. (Again, the units at either side of the network must be
populated equally with the appropriate number of demodulator cards.)
Such configurations allow transmission of a single carrier from an originating remote CDM-840,
a benefit that results in requiring operation of a lower-wattage BUC and/or use of a smaller
antenna, when compared with what would be required with multiple carriers transmitted from
a remote site.
Care should be taken to insure that differential in receive gain between the hub
antenna and remote mesh antennas does not exceed TBD.
L.3.2

dMesh Operation

Meshed links can be set up based on specific applications that are sent from one remote site to
another remote site or group of remotes sites. The easiest way to demonstrate the meshing
capability of a Vipersat-managed Advanced VSAT Network is by using Distribution Lists.
Distribution Lists allow you to set up a list of sites to be included in a switch under defined
circumstances, such as meshing based on an ECM switch, multicast transmission from a remote
to a group of remotes, or the setup of monitor remotes. This feature can be used to tune
expansion demodulators at a list of sites for upstream switched services, to provide for point-to-
multipoint distribution on an InBand service connection.
L–6
MN-CDM840
Revision 3