> Is it the telco who prvides us what we should use as framing, linecode and
> encapsulation? or does it depend on the csu/dsu being used. ???
Telco configures the line for the proper coding. ESF/B8ZS is the most
common, however SF/AMI is still around. A local carrier here normally
provisions their lines (across town for example) for SF/AMI unless the
customer requests otherwise.
PPP vs. HDLC refers to the line encapsulation, or what the routers use to
communicate. This is independent of the line coding (ESF/B8ZS). If you
are talking Cisco to Cisco equipment use HDLC. If you are talking Cisco
to something else, PPP is the way to go since Cisco's HDLC is a proprietary
implementation. (PPP is common when talking to ISP's. Even if they have
Cisco gear because it makes PPP their standard).
Ed
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