Editing Synchronous Data Link Control (section)

=== Naming differences ===
HDLC renamed some SDLC frames.  The HDLC names were incorporated into later versions of SDLC:<ref name=GA27-3093-3>{{cite tech report |url=http://www.textfiles.com/bitsavers/pdf/ibm/datacomm/GA27-3093-3_SDLC_Concepts_Jun86.pdf |title=Synchronous Data Link Control: Concepts |edition=4th |date=June 1986 |id=Document No. GA27-3093-3 |author=IBM Communication Products Division}}</ref>{{Rp|73}}
{|class=wikitable
!colspan=2| Original name ||colspan=2| New name
|-
| NSA || Nonsequenced acknowledge || UA || Unnumbered acknowledge
|-
| NSI || Nonsequenced information || UI || Unnumbered information
|-
| NSP || Nonsequenced poll || UP || Unnumbered poll
|-
| ROL || Request online || DM || Disconnected mode
|-
| CMDR || Command reject || FRMR || Frame reject
|-
| RQI || Request initialization mode || RIM || Request initialization mode
|-
| RQD || Request disconnect || RD || Request disconnect
|}