Comtech EF Data MetaCarrier MCDD-100, Installation And Operation Manual

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MCDD-100 MetaCarrier Detection Device Revision 3
Introduction MN-MCDD100
1–3
Detection of the presence of the MetaCarrier is initiated in the MCDD-100 by searching, using
digital signal processing techniques, for one of two possible MetaCarrier chip rates. These
MetaCarrier chip rates are as follows:
Host Carrier Embedded MetaCarrier
≥512 ksps 224 kcps
128 ksps to < 512 ksps 112 kcps
As shown in this table, the MetaCarrier is sized to be no more than 43.75% of the bandwidth of
the transmission carrier. In all configurations of the combined carrier, the MetaCarrier power
raises the total transmission power less than 0.01 dB.
The CID message consists of at least the following information:
• DVB Carrier ID Global Unique Identifier (read only, fixed by the transmission equipment
manufacturer)
• Carrier ID format (code to indicate version information for the Carrier ID format)
Additional user configurable fields may contain other information, for example:
•
Latitude and longitude information
•
Contact telephone number
•
Other user data
The entire CID message is composed of 4 packets containing 244 bits (formatting, Forward Error
Correction (FEC), and user information) for a total message length of 976 bits for the
transmission of the MetaCarrier. Each packet of the MetaCarrier message carries 32 bits of CID
information data. However, the MAC address is sent at a higher rate so that, upon reception of a
frame that is comprised of three (3) packets, the MAC address may be determined.
The data rate of messages being carried in the MetaCarrier is shown before spreading is applied.
The associated time to send a complete CID message (including the framing and FEC) is as
follows:
Embedded MetaCarrier CID Data Rate Time for Complete Message
224 kcps 55 bps 17.8 seconds
112 kcps 27 bps 35.7 seconds
Therefore, the time for the MCDD-100 to extract a complete MAC sequence is as follows:
Embedded MetaCarrier CID Data Rate Time for Unique ID
224 kcps 55 bps 35.6 seconds
112 kcps 27 bps 71.2 seconds
The MCDD-100 may be monitored and controlled using its HTTP Web Server Interface (for user-to-
device control) or via
Simple Network Management Protocol
(SNMP) (for device-to-device