# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
< Back to glossary


A frame typically resides at Layer 2 , the data link layer, of the OSI (Open System Interconnection) seven layer model. The frame relates to the header and trailer that surround the higher layer PDU (Protocol Data Unit). Typical frames include HDLC (High Level Data Link Control) in which the frames are delineated by flags which consist of zero followed by six ones and then a zero. No other bit sequence in the flow will have this combination. To avoid this combination at any other time bit stuffing is used.

Enhance your knowledge further with our OnlineAnytime Training.

We have package options designed for individuals, teams and organisations. Our packages include:

5G content and courses continually being added
Access to NetX...supporting in understanding network complexities
ITP Certified courses also providing CPD learning credits
Access via Tablet, Desktop and Smartphone...maximising learning opportunities
View our package options

Need more information? Want to know more about what we do?
Contact Us or Call +44 (0) 1524 844669

Working together with