Editing List of interface bit rates (section)

====[[Narrowband]] ([[plain old telephone service|POTS]]: 4&nbsp;kHz channel)====
{|class="wikitable sortable"
|-
! Technology !! Rate !! Rate {{abbr|ex.|excluding}} overhead !! Year
|-
|align=left | [[Morse code]] (skilled operator)
|align=right| '''{{val|0.021|u=kbit/s}}'''{{efn|name=morse_bps|1=Morse can transport 26 alphabetic, 10 numeric and one interword gap plaintext symbols. Transmitting 37 different symbols requires 5.21&nbsp;[[bit]]s of information (2<sup>5.21</sup>&nbsp;= 37). A skilled operator encoding the benchmark "PARIS" plus an interword gap (equal to 31.26&nbsp;bits) at 40&nbsp;wpm is operating at an equivalence of {{nowrap|20.84 bit/s}}.}}
|align=right| {{val|4|ul=characters per second}} (cps) ({{val|p=~|ul=wpm|40}}){{efn|name=morse_wpm|1=WPM, or words per minute, is the number of times the word "PARIS" is transferred per minute. Strictly speaking the code is quinary, accounting inter-element, inter-letter, and inter-word gaps, yielding 50 binary elements (bits) per one word. Counting characters, including inter-word gaps, gives six characters per word or 240 characters per minute, and finally four characters per second.}}
|align=left| 1844
|-
|align=left |Normal human speech
|align=right| '''{{val|0.039|u=kbit/s}}'''<ref>{{Cite web |title=Human Speech May Have a Universal Transmission Rate: 39 Bits Per Second |url=https://www.science.org/content/article/human-speech-may-have-universal-transmission-rate-39-bits-second |access-date=2022-06-24 |date=2019-09-04 |website=science.org |language=en}}</ref>
|
| prehistoric
|-
|align=left | [[Teleprinter]] (50 baud)
|align=right| '''{{val|0.05|u=kbit/s}}'''
|align=right| 404 operations per minute
|align=left| 1940x
|-
|align=left | Modem 110 [[baud]] ([[Bell 101]])
|align=right| '''{{val|0.11|u=kbit/s}}'''
|align=right| {{val|0.010|u=kB/s}} (~10 cps){{efn|name=modem|1=All modems are wrongly assumed to be in serial operation with 1 start bit, 8 data bits, no parity, and 1 stop bit (2 stop bits for 110-baud modems). Therefore, currently modems are wrongly calculated with transmission of 10 bits per 8-bit byte (11 bits for 110-baud modems). Although the serial port is nearly always used to connect a modem and has equivalent data rates, the protocols, modulations and error correction differ completely.}}
|align=left | 1959
|-
|align=left | Modem 300 (300 baud; [[Bell 103]] or [[ITU-T V.21|V.21]])
|align=right| '''{{val|0.3|u=kbit/s}}'''
|align=right| {{val|0.03|u=kB/s}} (~30 cps){{efn|name=modem}}
|align=left | 1962<ref name="daxal">{{citation|url=http://www.surfthe.us/reference/modem-timeline.html |title=Modem Types and Timeline |date=2003-12-16 |access-date=2009-04-16 |publisher=Daxal Communications |url-status=dead |archive-url=https://web.archive.org/web/20081008074601/http://www.surfthe.us/reference/modem-timeline.html |archive-date=2008-10-08}}</ref>
|-
|align=left | Modem 1200/75 (600 baud; [[ITU-T V.23|V.23]])
|align=right| '''{{val|1.2|/|0.075|u=kbit/s}}'''
|align=right| {{val|0.12|/|0.0075|u=kB/s}} (~120 cps){{efn|name=modem}}
|align=left | 1964(?)<ref name="ITU_VSeries" /><!--Originally adopted 1964/Geneva according to standard document itself, not clear if 1200 was later addition to an original 600 standard or dates to 1964 -->
|-
|align=left | Modem 1200 (600 baud; Vadic VA3400, [[Bell 212A]], or [[ITU-T V.22|V.22]])
|align=right| '''{{val|1.2|u=kbit/s}}'''
|align=right| {{val|0.12|u=kB/s}} (~120 cps){{efn|name=modem}}
|align=left | 1976
|-
|align=left | Modem 1200 (Bell 202C, 202D)
|align=right| '''{{val|1.2|u=kbit/s}}'''
|align=right| {{val|0.15|u=kB/s}} (~150 cps)
|align=left | 1976
|-
|align=left | Modem 2000 (Bell 201A)
|align=right| '''{{val|2|u=kbit/s}}'''
|align=right| {{val|0.25|u=kB/s}} (~250 cps)
|align=left | 1962
|-
|align=left | Modem 2400 (Bell 201B)
|align=right| '''{{val|2.4|u=kbit/s}}'''
|align=right| {{val|0.3|u=kB/s}} (~300 cps)
|align=left | ?
|-
|align=left | Modem 2400 (600 baud; [[V.22bis]])
|align=right| '''{{val|2.4|u=kbit/s}}'''
|align=right| {{val|0.3|u=kB/s}}{{efn|name=modem}}
|align=left | 1984<ref name="ITU_VSeries" /><!--Originally adopted in 1984/Malaga-Torremolinos according to standard document itself -->
|-
|align=left | Modem 4800/75 (1600 baud; [[V.27ter]])
|align=right| '''{{val|4.8|/|0.075|u=kbit/s}}'''
|align=right| {{val|0.6|/|0.0075|u=kB/s}}{{efn|name=modem}}
|align=left | 1976<ref name="ITU_VSeries" /><!--Originally adopted 1976/Geneva according to standard document itself -->
|-
|align=left | Modem 4800 (1600 baud, Bell 208A, 208B)
|align=right| '''{{val|4.8|u=kbit/s}}'''
|align=right| {{val|0.6|u=kB/s}}
|align=left | ?
|-
|align=left | Modem 9600 (2400 baud; [[ITU-T V.32|V.32]])
|align=right| '''{{val|9.6|u=kbit/s}}'''
|align=right| {{val|1.2|u=kB/s}}{{efn|name=modem}}
|align=left | 1984<ref name="ITU_VSeries" /> <!--Originally adopted in 1984/Malaga-Torremolinos according to standard document itself -->
|-
|align=left | Modem 14.4 (2400 baud; [[V.32bis]])
|align=right| '''{{val|14.4|u=kbit/s}}'''
|align=right| {{val|1.8|u=kB/s}}{{efn|name=modem}}
|align=left | 1991<ref name="daxal" />
|-
|align=left | Modem 28.8 (3200 baud; [[ITU-T V.34|V.34]]-1994)
|align=right| '''{{val|28.8|u=kbit/s}}'''
|align=right| {{val|3.6|u=kB/s}}{{efn|name=modem}}
|align=left | 1994
|-
|align=left | Modem 33.6 (3429 baud; [[ITU-T V.34|V.34]]-1996/98)
|align=right| '''{{val|33.6|u=kbit/s}}'''
|align=right| {{val|4.2|u=kB/s}}{{efn|name=modem}}
|align=left | 1996<ref name="ITU_VSeries">{{cite web |title=ITU-T Recommendations: V Series: Data communication over the telephone network |url=https://www.itu.int/rec/T-REC-V/en |publisher=ITU}}</ref>
|-
|align=left | Modem 56k (8000/3429 baud; [[ITU-T V.90|V.90]])
|align=right| '''{{val|56.0|/|33.6|u=kbit/s}}'''{{efn|name="56k"|1=[[56K modem]]s: V.90 and V.92 have just 5% overhead for the protocol signalling. The maximum capacity can only be achieved when the upstream (service provider) end of the connection is digital, i.e. a DS0 channel.}}
|align=right| {{val|7|/|4.2|u=kB/s}}
|align=left | 1998
|-
|align=left | Modem 56k (8000/8000 baud; [[V.92]])
|align=right| '''{{val|56.0|/|48.0|u=kbit/s}}'''{{efn|name="56k"}}
|align=right| {{val|7|/|6|u=kB/s}}
|align=left | 2001
|-
|align=left | Modem data compression (variable; [[V.92]]/[[ITU-T V.44|V.44]])
|align=right| '''{{val|56.0|–|320.0|u=kbit/s}}'''{{efn|name="56k"}}
|align=right| {{val|7|–|40|u=kB/s}}
|align=left | 2000<ref name="ITU_VSeries" />
|-
|align=left | ISP-side text/image compression (variable)
|align=right| '''{{val|56.0|–|1000.0|u=kbit/s}}'''
|align=right| {{val|7|–|125|u=kB/s}}
|align=left | 1998<ref name="ITU_VSeries" /><!--By inference from V.56 date-->
|-
|align=left | [[ISDN]] [[Basic Rate Interface]] (single/dual channel)
|align=right| '''{{val|64|/|128|u=kbit/s}}'''{{efn|name=isdn|1=Effective aggregate bandwidth for an ISDN installation is typically higher than the rates shown for a single channel due to the use of multiple channels. A [[basic rate interface]] (BRI) provides two "B" channels and one "D" channel. Each B channel provides {{nowrap|64 kbit/s}} bandwidth and the "D" channel carries signaling (call setup) information. B channels can be bonded to provide a {{nowrap|128 kbit/s}} data rate. Primary rate interfaces (PRI) vary depending on whether the region uses E1 (Europe, world) or T1 (North America) bearers. In E1 regions, the PRI carries 30 B-channels and one D-channel; in T1 regions the PRI carries 23 B-channels and one D-channel. The D-channel has different bandwidth on the two interfaces.}}
|align=right| {{val|8|/|16|u=kB/s}}
|align=left | 1986<ref name="massey-1">{{citation|url=https://www.telephonetribute.com/timeline.html |title=Timeline of Telecommunications |first=David |last=Massey |date=2006-07-04 |access-date=2009-04-16 |work=Telephone Tribute}}</ref>
|-
|align=left | [[ISDN digital subscriber line|IDSL]] (dual ISDN + {{nowrap|16 kbit/s}} data channels)
|align=right| '''{{val|144|u=kbit/s}}'''
|align=right| {{val|18|u=kB/s}}
|align=left | 2000<ref>[http://www.adam.com.au/about_history.php Adam.com.au]</ref>
|}