ZyXEL Omni TA 128 User Guide - Page 50
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Dead Up Opened Establish Authetication Fail Fail Down Terminate Closing Network Figure 6 -1 Point to Point Link Pathway Data will be transmitted only when the link is in the open phase. Negotiation details are described in RFC1661. Feature list Async to Sync Conversion PPP uses HDLC-like framing as encapsulation, which can be bitoriented or character-oriented. Most ISDN routers use bit-oriented HDLC framing, also known as synchronous transmission. However, serial transmission in most personal computers is still character-oriented, also known as asynchronous transmission. In order for an ISDN router and PC to communicate, it's necessary to do asynchronous to synchronous conversion. ZyXEL's TA128 can be used as a bridge. Any data from a PC to ZyXEL TA will be converted from asynchronous to synchronous form and vice versa. 38