D-Link DI-2000 Series User Manual page 5

Supports the encapsulation of the upper protocols on X.25, such as IP.
Supports switching between SVCs or PVCs of each synchronous port. The
DI-2000 series can be as X.25 small packet switches, also can connect multiple
X.25 devices through a special line connected with the public packet switching
network.
Supports X.32. The series can connect with the public packet switching network
by synchronous dialing.
Provides the packet assembler/disassembler (PAD) function. The series
complies with ITU-T X.3,X.28 and X.29, and can offer X.25 access service for
non-X.25 terminal.
Supports all X.25 optional businesses.
Supports the IP access over X.28.
2. Frame Relay Protocol
Frame Relay protocol is a fast packet switching technology to improve data
volume by simplifying the data-link layer and network layer. The DI-DI-2000
series mostly provides the following functions:
Supports three types of general Frame Relay local management interface(LMI),
including ITU-T Q.933 Annex A, ANSI T1.617 Annex D and Group of Four Frame
Relay interface standard.
Supports two general frame encapsulation formats, including ITU-T Q.922 Annex
A and ANSI T1.618.
Supports the interconnection with the Frame Relay backbone network and direct
connection with router devices and network cards.
Supports the encapsulation of the upper protocols in Frame Relay, such as IP.
The series complies with RFC1294 and RFC 1490, and can identify the special
encapsulation format of Cisco routers.
Supports Inverse ARP described in RFC1293 and allow to detect the IP address
map of virtual circuit dynamically.
Supports congestion control and comply with ITU-T I.370 and ITU-T Q.922
Appendix I. The series can increase or decrease data volume over ports
according to network congestion status.
Support Frame Relay switching between each synchronous port on the data-link
layer as Frame Relay switches. The series can also connect multiple FR devices
through a special line connected with a Frame Relay backbone network.
3. PPP protocol
PPP protocol provides multi-protocol transmit of data-packet on the point to point
link. The DI-2000 series have the following functions:
Complies with RFC1661 and supports link control protocol(LCP) to establish,
configure and test data link.
DI-2000 Series Routers hardware installation manual
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