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Common WAN terminology:
Customer Premises Equipment (CPE); devices physically located on the
subscriberís premises. This includes devices owned by the subscriber
and leased by the service provider. Your CPE is the data terminal
equipment (DTE), and the DCE is the device used to convert the user
data from DTE into a form acceptable to the WAN service provider
(EX: CSU/DSU). If the port is configured as DTE, it will require
external clocking from the CSU/DSU or other DCE device. A modem, CSU/DSU,
or TA/NT1 can be used to convert the user data from the DTE into a
form acceptable to the WAN service facility.
Demarcation (demarc); the juncture at which the CPE ends and the
local loop begins. It often occurs at a telecommunication closet on
the clientís premises.
Local Loop (last mile); cabling (usually copper) that extends from
the demarc in the WAN service providerís CO.
CO (Central Office); a telco switching facility that provides the
nearest point of presence for the providerís WAN services.
Toll Network; the collective telco switched and facilities (called
trunks) inside the WANís provider cloud.
Synchronous; uses an imposed time ordering at the sending and
receiving ends of the link. Both sides agree to a certain speed, but
the devices adjust their rates to match a clock source. Synchronous
uses idle frames so that clocks can be adjusted on the receiving
end, maintaining synchronization. Synchronous protocols allow more
throughput than asynchronous protocols, but are more expensive.
Asynchronous; The lack of imposed time ordering on a bit stream.
Uses start bytes and stop bytes. Asynchronous is not concerned with
Multilink; this is a method of serial transfer load balancing in
which packets are broken up before transmitted, sent across each
link, and reassembled on the other side.