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Prestige 681 SDSL Router
4-8 Internet Access
4.6 Encapsulation
Note: You must restart the P681 when you change the Encapsulation method in Menu 4 or
Menu 11.1.
Your service provider should provide you with this information.
4.6.1 Encapsulation with Ascend/Lucent Link Compatibility
You have two choices for
Encapsulation
when you use
Ascend/Lucent
Link Compatibility
.
RFC 1490
RFC 1490 describes Multiprotocol over Frame Relay encapsulation which is an encapsulation method for
carrying network interconnect traffic (both bridging and routing) over a frame relay backbone. It also
describes a simple fragmentation procedure for carrying large frames over a frame relay network with a
smaller MTU (Maximum Transmission Unit).
PPP
RFC 1662 defines PPP over HDLC
(High-level Data Link Control). HDLC is a bit-oriented, (meaning that
the data is monitored bit by bit) link layer protocol for the transmission of data over synchronous networks.
Transmissions consist of binary data without any special control codes. Information in the frame contains
control and response commands, however. HDLC supports full-duplex transmission in which data is
transmitted in two directions at the same time, resulting in higher throughput. HDLC is suitable for point-
to-point and multipoint (multidrop or one-to-many) connections.
4.6.2 Encapsulation with Copper Mountain Link Compatibility
You have four choices for
Encapsulation
when you use
Copper Mountain
Link Compatibility
. Your
service provider should tell you this information as the choice depends on what “networking model" they
are using with their CopperEdge concentrator. Please see the Copper Mountain web site for detailed
information on “networking models" and the CopperEdge concentrator.
PPP
Select this option when the peer is using a “PPP over ATM” or “PPP over Frame Relay” networking model.
CMN 1483
This is a Copper Mountain variant of RFC 1483. Select this option when the CopperEdge employs IP
routing, 1483 FUNI encapsulation and the “CopperVPN” or “VWAN” networking models.
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