E1 And T1 Modules - HP ProCurve Secure 7000dl Series Basic Management And Configuration Manual

Overview
Hardware Overview
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For information on these or additional modules, please check the ProCurve
Web site at www.procurve.com. Click on Products & Solutions in the left
bar, then click on Secure Router 7000dl series under WAN.

E1 and T1 Modules

E-carrier lines are used in Europe, Asia, Australia, and South America.
T-carrier lines are used in the United States, Canada, and, to some degree,
in Japan.
Japan uses J-carrier lines for voice and both T-carrier and E-carrier lines for
data. J-carrier lines are not supported by the ProCurve Secure Router.
The type of module you purchase to support your E1 or T1 WAN connection
depends on how your public carrier implements the Channel Service Unit/
Digital Service Unit (CSU/DSU) that is required for E1- and T1-carrier lines.
The CSU/DSU has two main functions. The DSU accepts traffic from the router
and translates it from the signaling format used on the LAN to the format
necessary for transmission on the WAN. The CSU then generates the signal to
be sent across the WAN.
The public carrier can provide:
the CSU/DSU as one complete unit
only the CSU
neither the CSU nor the DSU
Common practice varies depending on the region in which the public carrier
operates. In Europe, Asia, Australia, or South America, the public carrier will
either provide the CSU/DSU or just the CSU. In North America, the public
carrier will provide the CSU/DSU, or the public carrier will not provide either
the CSU or DSU. (For more information about E1- and T1-carrier lines, see
Chapter 4: Configuring E1 and T1 Interfaces.)
E1 Modules. If you are leasing an E1-carrier line and the public carrier
provides only the CSU, you will need to purchase one of the E1 modules, which
include a built-in DSU. (See Figure 1-7.) You can select:
a one-port E1 module, which supports a full E1-carrier line (32 channels
or 2.048 Mbps)
a two-port E1 module, which provides 2.048 Mbps on each interface (4.096
Mbps total)
an E1 + G.703 module, which enables you to use some channels for data
and some channels for voice