ZyXEL Communications Omni TA128 - Manual (Page 50)

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Dead Establish Authetication
Network Terminate
Up Opened
Fail
Closing
Down
Fail
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 bit-
oriented 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.