User guide

Customer Premises Equipment
1/1551-HSC 901 35/3 Uen C 2005-12-02
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Figure 29 CPE Equipment Protocol Termination
Some ADSL modems are able to operate in either bridged or routed mode.
A bridging modem requires a minimum of configuration, but does not
provide any security for hosts connected through it.
A routing modem, on the other hand, often provides means for enhancing
the security, for example by firewall and NAT function. If telephony is
required, the CPE should provide a POTS interface to legacy telephones.