Cabling the Serial Wide Area Network
As you can imagine, there are a few things that you need to know before connecting your WAN in order to make sure everything goes well. For starters, you have to understand the kind of WAN Physical layer implementation that Cisco provides as well as ensure that you’re familiar with the various types of WAN serial connectors involved.
The good news is that Cisco serial connections support almost any type of WAN service. Your typical WAN connection is a dedicated leased line using HDLC, PPP, and Frame Relay with speeds that can kick it up to 45Mbps (T3).
HDLC, PPP, and Frame Relay can use the same Physical layer specifications, and I’ll go over the various types of connections and then move on to telling you ...