
Technical Information B-1
Appendix B
Technical Information
This chapter describes technical and serial port information.
Technical Specifications
Standards Compatibility
Your I-modem uses multiple standard data communications protocols and is
also compatible with many nonstandard schemes. The following schemes are
supported:
ISDN
This standard Supports
ITU-T Q.921 ISDN data link layer
ITU-T Q.931/I.451 ISDN call control signaling variants:
• AT&T 5ESS Custom
• Northern Telecom DMS-100
• National ISDN-1
• National ISDN-2
ITU-T V.120/I.463 Encapsulates asynchronous or synchronous data for
transmission over the ISDN at 56 or 64 kbps.
ITU-T V.110/I.462 Encapsulates asychronous or synchronous data for
transmission over the ISDN at 56 or 64 kbps.
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