Product specifications

CDM-840 Remote Router Revision 2
Appendix F MN-CDM840
F–12
F.4 Glossary of Terms
Abbreviation Term Comments
ASR Application Switch Request
ASR is a private protocol used by the CDM-840 to request
bandwidth from the VMS.
BUC Block Up Converter
The BUC is used in the Tx (uplink) of satellite signals to
convert a band of frequencies from a lower frequency to a
higher frequency.
CDRP Comtech Dynamic Routing Protocol
CDRP is used to simplify the deployment of Comtech EF
Data’s Advanced VSAT solution in an IP-routed network.
dSCPC Dynamic Single Channel Per Carrier
dSCPC is a Comtech EF Data FAST Feature used to
enable dynamic allocation and sharing of bandwidth among
users.
HCC Hub Channel Controller
The HCC is a dedicated CDD-880 that generates the TAP
and is responsible for all request transactions from each
CDM-840 while in Entry Channel Mode.
LNB Low-Noise Block Down Converter
The LNB is the receiving device on a parabolic satellite
dish used for the Rx (downlink) of satellite signals
RID Remote Identification
The RID is a message, presented to the Hub Channel
Controller upon each transmission into the Aloha channel,
which contains the IP Address and control flag.
SAS Set of Aloha Slots
SAS is used as random access for initial request
messaging from the CDM-840s.
SRS Set of Registration Slots
SRS is used for time sensitive management message
transactions.
SUM Status Update Message
SUM is used for updating VMS device control parameters,
such as Tx Frequency, Data Rate, Current MODCOD,
Eb/No, Es/No, ACM information, etc.
TAP
Transmission Announcement
Protocol
The TAP is the time and frequency reference message
sent on intervals to synchronize any listening CDM-840s
into the Entry Channel.
VMS Vipersat Management System
A VMS is a configuration, management, and control tool
that is used to configure the Advanced VSAT Network and
respond to network anomalies.