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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">3</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.1</b></font></td>
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<td bgcolor="#336666" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Serial Point-to-Point Links</font></strong></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">3.1.3</font></b></td>
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<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Demarcation point</font></strong></td>
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<font FACE="Arial" SIZE="2" COLOR="#000000">
The demarcation point, or "demarc" as it is commonly known, is the
point in the network where the responsibility of the service provider
or "telco" ends. In the United States, a telco provides the local loop into the
customer premises and the customer provides the active equipment such
as the channel service unit/data service unit (CSU/DSU) on which the
local loop is terminated. </font><font face="Arial" size="2">This
termination often occurs in a telecommunications closet and
the customer is responsible for maintaining, replacing,
or repairing the equipment.</font><p>
<font FACE="Arial" SIZE="2" COLOR="#000000">
In other countries around the world, the network terminating unit (NTU)
is provided and managed by the telco. This allows the telco to
actively manage and troubleshoot the local loop with the demarcation
point occurring after the NTU. The customer connects a customer
premises equipment (CPE) device, such
as a router or frame relay access device, into the NTU
using a V.35 or RS-232 serial interface.
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font></p>
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