3 Definitions and Abbreviations

26.2263GPPCellular text telephone modemGeneral descriptionRelease 17TS

3.1 Definitions

Cellular Text Telephone Modem: modem (consisting of transmitter and receiver) that allows the reliable transmission of text via the speech channel of cellular phone systems or PSTN networks

Baudot Code: modem signal and character coding scheme of the North American Text Telephone, as specified in ITU‑T V.18 [2], Annex A.1 ("5-bit operational code") and in ANSI TIA/EIA‑825 [4]

Text Telephone Code: modem signal and character coding scheme of any of the PSTN Text Telephone types supported by the harmonizing ITU-T Recommendation V.18 [2]

3.2 Abbreviations

For the purposes of this TS, the following abbreviations apply:

BP Band Pass

CER Character Error Rate

CTM Cellular Text Telephone Modem

FCC Federal Communications Commission

FEC Forward Error Correction

GSM Global System for Mobile communications

HCO Hearing Carry Over Alternating transmission of speech and text.

ITU-T International Telecommunication Union – Telecommunication standardization sector (former CCITT)

LP Low Pass

PCM Pulse Code Modulation

PSTN Public Switched Telephone Network

TTY Text Telephone

UCS Universal Multiple-Octet Coded Character Set

UMTS Universal Mobile Telecommunications Systems

VAD Voice Activity Detection

VCO Voice Carry Over alternating transmission of speech and text