Wide Area Networks (WAN) White Papers
Synchronous Data Link Control and Derivatives
Overview IBM developed the Synchronous Data Link Control (SDLC) protocol in the mid-1970s for use in Systems Network Architecture (SNA) environments. SDLC was the first of an important new breed of link-layer protocols based on synchronous, bit-oriented operation. Compared to synchronous character-oriented (for example, Bisync from IBM) and synchronous byte-count-oriented protocols (for example, Digital Data Communications Message Protocol (DDCMP) from Digital Equipment Corporation), bit-oriented synchronous protocols are more efficient, more flexible, and often faster. After developing SDLC, IBM submitted it to various standards committees. The International Organization for Standardization (ISO) modified SDLC to create the High-Level Data Link Control (HDLC) protocol. The International Telecommunication Union Telecommunication Standardization Sector (ITU-T) (formerly CCITT) subsequently modified HDLC to create Link Access Procedure (LAP), and then Link Access Procedure, Balanced (LAPB). The Institute of Electrical and Electronic Engineers (IEEE) modified HDLC to create IEEE 802.2. Each of these protocols has become important in its own domain. SDLC remains the primary SNA link-layer protocol for wide-area network (WAN) links.
| Publisher | Cisco Systems | File Format | HTML & PDF |
|---|---|---|---|
| Date Published | June 1999 | Downloads | 54 |
| Format | White Papers | ||
| Topics | |||
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