Overview Of E1 And T1 Wan Connections; Elements Of An E1- Or T1-Carrier Line - HP ProCurve 7000dl Series Basic Management And Configuration Manual

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Overview of E1 and T1 WAN
Connections
Public carriers offer E1- and T1-carrier lines for customers who need
dedicated, secure, point-to-point wide area network (WAN) connections. The
connection is always active, so data can be immediately transmitted at any
time, with no wait for a dial-up process.
In Europe, Australia, South America, and Asia, Public Telephone and Tele-
graph (PTT) authorities offer E1-carrier lines, which provide 2.048 Mbps
bandwidth. In the United States, Canada, and sometimes Japan, telcos offer
T1-carrier lines, which provide 1.544 Mbps bandwidth.
In Japan, PTTs offer T1-carrier lines and sometimes E1-carrier lines for data.
For traditional analog voice, these PTTs offer J1-carrier lines. (J1 lines are
outside the scope of the ProCurve Secure Router Management and Config-
uration Guide.)
An E1- or T1-carrier line can be used for both traditional analog voice and data—
a characteristic that can make it an appealing option for some companies. By
combining analog voice and data on an E1- or T1-carrier line, companies may
be able to save money on their telephone and data communications costs.

Elements of an E1- or T1-Carrier Line

All WAN connections, including E1- and T1-carrier lines, consist of three basic
elements:
the physical transmission media, such as the cabling, switches, routers,
and other infrastructure required to create and maintain the connection
electrical signaling specifications for generating, transmitting, and receiv-
ing signals through the various transmission media
Data Link Layer protocols, which provide logical flow control for moving
data between the peers in the WAN (peers are the devices at either end of
a WAN connection)
Configuring E1 and T1 Interfaces

Overview of E1 and T1 WAN Connections

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