Comtech EF Data CDM-570A - Manual (Page 305)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Optional Packet Processor - Serial/Telnet CLI Operation Revision 2
9–9
Working Mode
1) When you select Hot Key ‘C’ you are first prompted with:
“Changing Modem working mode requires system Reboot.
Do you want to continue (Y/N)[Enter :No]”
Press Y to continue; otherwise press N, [Enter], or [Esc] to quit and return to the
Administration page.
2) Working Mode is disabled when Brouter Mode VLAN Filtering is enabled . If you
attempt to select this item while configured as such, the following error
message displays:
“Can’t change Modem Working Mode when Brouter VLAN Filter is
Enabled”
Once you elect to continue with configuration, you are prompted to select the active Working
Mode:
Selection Description
1 – Router – Small Network Router uses 1 byte HDLC addresses
2 – Router – Large Network Router mode using 2 byte HDLC addresses
3 – Router – Point to Point Router mode uses 0 HDLC addresses to save satellite bandwidth
4 – Router – Vipersat Router mode when running in a Vipersat Network
5 – Managed Switch Default operating mode, and operates at 10/100BaseT. In this mode the Packet
Processor will forward both IP and non-IP datagrams over satellite without any
defined routes.
Managed Switch Multicast Option
If the Working Mode is Managed Switch and Multicast traffic is intended to pass
across a pair of modems, this option must be enabled on both modems.
The Managed Switch Multicast Option allows Multicast to be either transmitted or received
through the modem. This applies to Managed Switch Mode only. Managed Switch Mode will
normally filter Multicast traffic.
Header Compression Refresh Rates
Managed Switch Mode automatically uses L2 Header Compression (even if the
Header Compression option has not been purchased). Because of this, some of the
initial traffic sent between two devices is not received over the satellite until a full
Header is transmitted. For example, the default Header Compression Refresh Rate is
50 packets. When a ping is sent over the satellite, it times out until the full Header
packet is sent. The Header Compression Refresh Rate on the Administration page
can be reduced to minimize the amount of traffic lost when traffic is first sent
between two devices. Once communication between two devices has been
established, both modems are able to receive all traffic, unless one modem is power
cycled or reset.