Introduction

The HDLC/LAP-B (ABM) Protocol product is the Data Link or Level 2 layer used in conjunction with the Advanced Communications Controller (ACC) product family. The ITU (CCITT) recommends the Link Access Procedure Balanced (LAPB) protocol for frame-level information transfers on balanced data links (two data stations) in X.25 packet-switching networks. This manual provides installation and configuration information that is specific to the HDLC/LAP-B protocol and the Asynchronous Balanced Mode (ABM) of operation.