Editing Squelch (section)

===DCS===
<!-- "Digital-Coded Squelch" redirects here. -->
{| class="wikitable floatright"
|+ style="text-align: center;" | Standard DCS Codes
|-
! scope="col" | ''0nn'' !! scope="col" | ''1nn'' !! scope="col" | ''2nn'' !! scope="col" | ''3nn'' !! scope="col" | ''4nn'' !! scope="col" | ''5nn'' !! scope="col" | ''6nn'' !! scope="col" | ''7nn''
|-
| 023 || 114 || 205 || 306 || 411 || 503 || 606 || 703
|-
| 025 || 115 || 223 || 311 || 412 || 506 || 612 || 712
|-
| 026 || 116 || 226 || 315 || 413 || 516 || 624 || 723
|-
| 031 || 125 || 243 || 331 || 423 || 532 || 627 || 731
|-
| 032 || 131 || 244 || 343 || 431 || 546 || 631 || 732
|-
| 043 || 132 || 245 || 346 || 432 || 565 || 632 || 734
|-
| 047 || 134 || 251 || 351 || 445 ||     || 654 || 743
|-
| 051 || 143 || 261 || 364 || 464 ||     || 662 || 754
|-
| 054 || 152 || 263 || 365 || 465 ||     || 664 ||
|-
| 065 || 155 || 265 || 371 || 466 ||     ||     ||
|-
| 071 || 156 || 271 ||     ||     ||     ||     ||
|-
| 072 || 162 ||     ||     ||     ||     ||     ||
|-
| 073 || 165 ||     ||     ||     ||     ||     ||
|-
| 074 || 172 ||     ||     ||     ||     ||     ||
|-
|     || 174 ||     ||     ||     ||     ||     ||
|}

'''DCS''' (Digital-Coded Squelch), generically known as ''CDCSS'' (Continuous Digital-Coded Squelch System), was designed as the digital replacement for CTCSS. In the same way that a single CTCSS tone would be used on an entire group of radios, the same DCS code is used in a group of radios. DCS is also referred to as ''Digital Private Line'' (or ''DPL''), another trademark of Motorola, and likewise, General Electric's implementation of DCS is referred to as ''Digital Channel Guard'' (or ''DCG''). Despite the fact that it is not a tone, DCS is also called ''DTCS'' (Digital Tone Code Squelch) by [[Icom Incorporated|Icom]], and other names by other manufacturers. Radios with DCS options are generally compatible, provided the radio's encoder-decoder will use the same code as radios in the existing system.

DCS adds a 134.4&nbsp;[[bits per second|bit/s]] (sub-audible) bitstream to the transmitted audio. The code word is a 23-bit [[Binary Golay code|Golay]] (23,12) code which has the ability to detect and correct errors of 3 or fewer bits. The word consists of 12 data bits followed by 11 check bits. The last 3 data bits are a fixed '001', this leaves 9 code bits (512 possibilities) which are conventionally represented as a 3-digit [[octal]] number. Note that the first bit transmitted is the LSB, so the code is "backwards" from the transmitted bit order. Only 83 of the 512 possible codes are available, to prevent falsing due to alignment collisions.

DCS codes are standardized by the [[Telecommunications Industry Association]] with the following 83 codes being found in their most recent standard, however, some systems use non-standard codes.<ref>{{cite tech report |title=Land Mobile FM or PM – Communications Equipment – Measurement and Performance Standards, TIA-603-E |page=10 |institution=[[Telecommunications Industry Association]] |publication-date=March 2, 2016 }}</ref> For those PMR446 radios with 121 codes, the codes 39 to 121 are DCS codes:<ref>{{cite web |title=TLKR T8 Owner's Manual |url=https://www.motorolasolutions.com/content/dam/msi/docs/business/products/consumertwo-wayradios/mototlkr_t8/_documents/tlkr_t8_user_guide.pdf |publisher=[[Motorola Solutions]] |access-date=2023-01-23 |page=19 }}</ref>

{| class="wikitable"
|+ '''DCS'''
! '''Number'''
! '''DCS Code'''
! '''Number'''
! '''DCS Code'''
! '''Number'''
! '''DCS Code'''
|-
| '''39'''
| 023
| '''67'''
| 174
| '''95'''
| 445
|-
| '''40'''
| 025
| '''68'''
| 205
| '''96'''
| 464
|-
| '''41'''
| 026
| '''69'''
| 223
| '''97'''
| 465
|-
| '''42'''
| 031
| '''70'''
| 226
| '''98'''
| 466
|-
| '''43'''
| 032
| '''71'''
| 243
| '''99'''
| 503
|-
| '''44'''
| 043
| '''72'''
| 244
| '''100'''
| 506
|-
| '''45'''
| 047
| '''73'''
| 245
| '''101'''
| 516
|-
| '''46'''
| 051
| '''74'''
| 251
| '''102'''
| 532
|-
| '''47'''
| 054
| '''75'''
| 261
| '''103'''
| 546
|-
| '''48'''
| 065
| '''76'''
| 263
| '''104'''
| 565
|-
| '''49'''
| 071
| '''77'''
| 265
| '''105'''
| 606
|-
| '''50'''
| 072
| '''78'''
| 271
| '''106'''
| 612
|-
| '''51'''
| 073
| '''79'''
| 306
| '''107'''
| 624
|-
| '''52'''
| 074
| '''80'''
| 311
| '''108'''
| 627
|-
| '''53'''
| 114
| '''81'''
| 315
| '''109'''
| 631
|-
| '''54'''
| 115
| '''82'''
| 331
| '''110'''
| 632
|-
| '''55'''
| 116
| '''83'''
| 343
| '''111'''
| 654
|-
| '''56'''
| 125
| '''84'''
| 346
| '''112'''
| 662
|-
| '''57'''
| 131
| '''85'''
| 351
| '''113'''
| 664
|-
| '''58'''
| 132
| '''86'''
| 364
| '''114'''
| 703
|-
| '''59'''
| 134
| '''87'''
| 365
| '''115'''
| 712
|-
| '''60'''
| 143
| '''88'''
| 371
| '''116'''
| 723
|-
| '''61'''
| 152
| '''89'''
| 411
| '''117'''
| 731
|-
| '''62'''
| 155
| '''90'''
| 412
| '''118'''
| 732
|-
| '''63'''
| 156
| '''91'''
| 413
| '''119'''
| 734
|-
| '''64'''
| 162
| '''92'''
| 423
| '''120'''
| 743
|-
| '''65'''
| 165
| '''93'''
| 431
| '''121'''
| 754
|-
| '''66'''
| 172
| '''94'''
| 432
|
|
|}