�1���� General terms
������� 1.1���� 3.1 kHz handset telephony
������� 1.2���� 4-wire chain (see ITU-T G.101)
������� 1.3���� analogue network
������� 1.4���� circuit access point (see ITU-T G.101)
������� 1.5���� circuit, telecommunication circuit (see ITU-T G.101)
������� 1.6���� connection (see ITU-T G.101)
������� 1.7���� conversational quality
������� 1.8���� conversational speech quality
������� 1.9���� E-model
������ 1.10���� end-to-end quality
������ 1.11�� ��dB-related units (see
ITU-T G.101)
������ 1.12���� digital mobile system (DMS) (see ITU-T G.173)
������ 1.13���� extension line (see ITU-T G.101)
������ 1.14���� hypothetical reference connection (HRX)
������ 1.15���� input/output (see ITU-T G.111, ITU-T G.121, etc.)
������ 1.16���� mixed analogue-digital channel (circuit)
������ 1.17���� mouth-to-ear quality
������ 1.18���� national system (see ITU-T
G.101)
������ 1.19���� normal-band telephony
������ 1.20���� private automatic branch exchange (PABX)
�� ����1.21���� private branch
exchange (PBX)
������ 1.22���� private branch network (PBN)
������ 1.23���� private network
������ 1.24���� public switched telephone network (PSTN)
������ 1.25���� relative level (at a point on a circuit)
������ 1.26���� relative (power) level (see ITU-T G.101)
������ 1.27���� return loss
������ 1.28���� speech quality
������ 1.29���� speech transmission quality
������ 1.30���� subscriber circuit (see ITU-T G.101)
������ 1.31���� telephone circuit (see ITU-T G.101)
������ 1.32� ���transmission rating
model
������ 1.33���� transmission reference point (TRP) (see ITU-T G.101)
������ 1.34���� virtual international connecting point (VICP) (see ITU-T
G.101)
������ 1.35���� (one-way) voice transmission quality
������ 1.36���� wideband telephony
�2����
Transmission performance objectives
������� 2.1���� performance objective
������� 2.2���� design objective
������� 2.3���� commissioning objective
������� 2.4���� limits for maintenance purposes; maintenance limits
�3����
Transmission impairments
������� 3.1���� advantage factor
������� 3.2���� equipment impairment factor (Ie)
������� 3.3���� impairment factor
������� 3.4���� group-delay distortion
������� 3.5���� quantizing distortion unit (qdu) (see ITU-T G.113)
������� 3.6���� transmission rating factor (R)
�4����
Propagation time, echo and stability
������� 4.1���� balance return loss
������� 4.2���� circuit loudness rating (CLR) (see ITU-T G.111)
������� 4.3���� composite loss (see ITU-T G.101)
������� 4.5���� echo
������� 4.6���� echo balance return loss
������� 4.7���� echo control device
������� 4.8���� echo loss (LECHO)
������� 4.9���� hollowness
������ 4.10���� listener echo; receive end echo
������ 4.11���� listener echo loss; receive echo loss
������ 4.12���� listener echo loudness rating (LELR)
������ 4.13���� listener's sidetone rating (LSTR)
������ 4.14���� loudness rating (LR)
������ 4.15���� mean one-way propagation time
������ 4.16���� open-loop loss (OLL)
������ 4.17���� overall loudness rating (OLR)
������ 4.18�� ��path a-t-b
(transmission loss of �); semi-loop loss
���������������� 4.18.1���� semi-loop loss (possible alternative to the definition in 4.18)
������ 4.19���� receive loudness rating (RLR)
������ 4.20���� round-trip delay (DL)
������ 4.21���� send loudness rating (SLR)
������ 4.22���� sidetone masking rating, talker's sidetone (STMR)
������ 4.23���� singing margin (SM)
������ 4.24���� stability loss
������ 4.25���� talker echo
������ 4.26���� talker echo loudness rating (TELR); overall loudness rating of
the echo path
������ 4.27���� telephone circuit loss (see ITU-T G.101)
������ 4.28���� terminal coupling loss (TCL); weighted terminal coupling loss
(TCLw) (see ITU-T P.30)
������ 4.29���� test balance return loss (TBRL)
������ 4.30���� transmission time; total transmission time (TTT) (see ITU-T
G.114)
������ 4.31���� weighted listener echo path loss (WEPL)
������ 4.32���� weighted terminal coupling loss
�5����
Equipment
������� 5.1���� R or T pads (in telephone extension)
Annex A � The units dB, dBm, dBmp, dBr, dBm0
and dBm0p
������� A.1���� Introduction
������� A.2���� Fundamentals about dB, loss and gain
������� A.3���� The use of a reference signal and dBm, dBmp
������� A.4���� dBr, dBm0 and dBm0p
����������������� A.4.1���� General
����������������� A.4.2���� The use of dBr and dBm0 in equipment
design and performance testing
����������������� A.4.3����
The use of dBr and dBm0 in transmission planning and maintenance