DMD1050TS Satellite Modem Board
Revision 1
Theory of Operation 3–13 MN-DMD1050TS
Table 3-1. DMD1050TS HDLC Interoperation
1
1
1
1
1
Configuration)
PLR5584-1 10/100/1000 Radyne
Gigabit Bridge Card, Bridge Mode (1.1.2)
SLM-5650A
Network Processor Card (GIGE Bridge
Mode)
Radyne
1
Interoperates in any common selectable mode
3.7.1.1 Configure the Modem to use the Ethernet Data Interface
When the optional Ethernet Data Interface Card is selected, all of the Ethernet related menus can
be used to control the interface.
1. Setup the Tx Interface Menu to: (see Chapter 7)
a. Set the Terrestrial Interface to Ethernet
b. Set the Ethernet Flow Control as desired
c. Set the Ethernet Daisy Chain as desired
d. Set the Ethernet QOS Type as desired
e. Set the Ethernet QOS Queue as desired
f. The Tx Clock is set to SCTE automatically
i. The Tx Clock Polarity is set to Normal automatically
2. Setup the Rx Interface Setup Menu to: (see Chapter 7)
a. Set the Terrestrial Interface to Ethernet.
b. Set the Buffer Size to Zero (provides minimum delay).
c. Buffer Clock is set to Rx Sat.
d. Set the Buffer Clock Polarity to Normal.
3.7.1.2 Ethernet Flow Control
When Ethernet Flow Control is disabled, if a packet is received for transmission and no packet
buffer space is available, the incoming packet is discarded.
When Ethernet Flow Control is enabled, flow control is used to throttle the transmission station to
avoid overrunning the transmit buffers. This overrun would cause packets to be dropped. The
throttling mechanism used depends on the interface, and whether it is half- or full-duplex.
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