ETSI - ETS 300 118
Attachments to the Public Switched Telephone Network (PSTN) Category II Attachment Requirements for 1200 Bits per Second Half Duplex and 1200/75 Bits per Second Asymmetrical Duplex Modems Standardized for Use on the PSTN
| Organization: | ETSI |
| Publication Date: | 1 January 1991 |
| Status: | inactive |
| Page Count: | 23 |
scope:
This European Telecommunication Standard (ETS) specifies the technical characteristics to be met by a modem seeking Category II approval for
- half duplex operation over the PSTN at 1200 bits per second; and/or
- asymmetrical duplex operation over the PSTN at 1200/75 bits per second.
The modulation schemes specified are those described in CCITT Recommendation V.23 [4].
The term "modem" in the context of this ETS includes all physical implementation practices for a voice band modem, which are galvanically connected to the PSTN.
This ETS specifies four modes of operation/use (see subclause 5.2).
This ETS also contains descriptions of the tests to be performed in order to confirm compliance with the functional requirements contained herein. A general description of the test conditions and test requirements is given in Annex A (Normative).
NOTE: To aid reading, the term "forward channel" is sometimes used to describe the channel capable of transmitting up to 1200 bit/s, and the term "backward channel" is similarly used to describe the channel capable of transmitting up to 75 bit/s.
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