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OM20 Universal Outdoor Modem
Pattern Error Count:
Carrier Type:
RESTART TEST PATTERN:
6.4
Configuring the OM20 to use the Ethernet Data Interface (Optional)
The OM20 Ethernet related menus are available and can be used to control the data interface as
follows:
Under the Interface Menu:
Under the Tx Setup Menu:
Under the Interface Menu:
Under the Rx Setup Menu:
6.4.1 Ethernet Flow Control
When disabled, if a packet is received for transmission and no packet buffer space is available,
the incoming packet is discarded.
When enabled, flow control is used to throttle the transmission station in order to avoid
overrunning the transmit buffers, which would in turn cause packets to be dropped. The
throttling mechanism used depends upon the interface and whether it is half-duplex or full duplex
and is described in the following sub-paragraphs:
6.4.1.1
Half-Duplex Flow Control
In half-duplex mode, the OM20 uses industry standard backpressure to support flow control as
follows:
MN-OM20– Revision 5
{NO SYNC, nnnn x 10n}
Displays the number of errors detected by the test pattern
checker.
{NORMAL, CW, DUAL, OFFSET POS FIR, NEG FIR}
Set the Terrestrial Interface to Ethernet.
Set the Ethernet Flow Control as desired (refer to Section 6.3.1 for details).
Set the Tx Clock to SCTE.
Set the Tx Clock Polarity to Normal.
Under Drop & Insert:
Set the Drop Mode to None.
Set the Terrestrial Interface to Ethernet.
Set the Buffer Size to Zero.
Set the Buffer Clock to Rx Sat.
Set the Buffer Clock Polarity to Normal.
Under Drop & Insert:
Set the Insert Mode to None.
Clicking this button resets the test pattern counter and
generator.
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