G–1
Appendix G. ECM (ENTRY
CHANNEL MODE)
G.1 Functional Overview
G.1.1 ECM Terminology
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.
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