:


      DTE                          DCE

(station, router) ** ------ ** (modem) <====  



EIA/TIA-232
EIA/TIA-449
V.24
V.35
X.21
G.703
EIA.530
HSSI



Data link encapsulation   :

Dedicated WAN
SDLC        - Synchronous Data Link Control
HDLC        - High-level Data Link Control
LAPB        - Link Access Procedure Balanced
PPP         - Point-to-Point Protocol

Switched WAN
Frame Relay -   HDLC 
X.25
ISDN

Last-modified: Sun, 27 Sep 1998 07:09:41 GMT
: