OM20 Universal Outdoor Modem Theory of OperationTM116 – Rev. 1.2 4-264.16 EDMAC Satellite Framing/Deframing ModeThe modem supports EDMAC satellite framing. EDMAC can be enables for both modulator anddemodulator satellite framing when modem is configured in CLOSED NET applications. EDMACsatellite framing DOES NOT allow control or monitoring of the remote slave modem. On thedemodulator, terrestrial date is framed with NULL EDMAC commands, having no effect at theremote demodulator. On the demodulator, EDMAC commands are stripped from the satellite datastream and discarded, leaving the terrestrial data steam intact. EDMAC Framing/Deframing isprovided for compatibility purposes only.4.17 Locating the ID Code Operational ProcedureThe modem has unique ID codes that allow the user to add feature upgrades to the modemwithout the unit having to be returned to the factory. Users are required to identify these ID codeswhen they want additional features added to their unit. Radyne will supply a new ID code that isrequired to be entered in the ID code field. Once the new ID code is entered, the modem willactivate the new features.Refer to Appendix B for upgrade procedures.4.18 Strap CodesThe Strap Code is a quick set key that sets many of the modem parameters. For quick setup ofthe modem, Strap Codes are very helpful. When a Strap Code is entered, the modem isautomatically configured for the code’s corresponding data rate, overhead, code rate, framing,scrambler type and modulation. An example of how to set a strap code follows:Example: In the Ethernet interface Menu, depress the Transmit Gel-tab, then movethe cursor down and depress “General”. Now move the cursor over to ‘Strap Code’. Click insidethe box and enter the new strap code submenu and enter #16. The modem will be automaticallyconfigured to the parameters shown below in the highlighted row ‘Strap Code 16’.Refer to Appendix G for the various strap code options.
