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 ¼); 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