CDM-840 Remote Router MN-CDM840
Ethernet-based Remote Product Management Revision 3
6–62
Keeping CDM-840(s) in the ECM channel may result in oversubscription, where some
percentage of remotes wait their turn for pooled SCPC resources. The user may choose to
selectively control remotes through manual, scheduled, or external switch request commands.
By selecting Wait, the CDM-840(s) remain in standby mode, but continue to send status
messages to the VMS and to the CTOG-250 Comtech Traffic Optimization Gateway with
CDM-800 Gateway Router.
In Wait mode, messages directed to the VMS update connected link status, while ACM, CDRP,
and traffic data statistics sent to the CTOG-250 (in dynamic routing mode) maintain forward path
ACM and routing tables.
The CDM-840 powers up, requests network registration, and switches to dSCPC at its minimum
site policy data rate setting. This is the most common mode of operation.
Click [Submit] to save.
• Multicast IP – Enter the IP address for the Multicast of the Transmission Announcement
Protocol (TAP) message that is sent out by the CDD-880 Multi Receiver Router to all of the
associated CDM-840 Remote Routers in that group.
• Group ID (0 to 255) – Enter the Group ID number for the CDD-880 to which this unit
belongs.
• Power Hunt Enable – Use the drop-down list to select this function as Disable or Enable.
When enabled, the transmission power control feature for the unit modulator is activated
while in Entry Channel Mode (ECM). This function provides compensation during periods of
impaired transmission or for instances when the initial (baseline) power value is insufficient,
and assists in maintaining return link integrity.
• Rx LO Frequency – Assign a value, in MHz, to the Rx LO (Low Oscillator) Frequency.
• Tx LO Frequency – Assign a value, in MHz, to the Tx LO (Low Oscillator) Frequency.
• ECM Power (-40.0 to 0.0) – Enter the power level, in dBm, for transmission of the Aloha
ECM signal. This level was determined for this unit when its terminal was commissioned,
and must be calibrated with the satellite provider.
Click [Submit] to save.
ECM Remote Status
This section provides the following read-only information:
• Cycle Length – The Cycle Length is the total length of time, in milliseconds, between the
start of a transmission and the completion of the transmission cycle (TAP) transmitted by
the CDD-880 to the CDM-840 or CDM-840 Remote Routers in the ECM group. It is the
product of the number of slots and the slot length (consisting of the preamble, data slot
size, and guard band).
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