Motorola 68230 - Vanguard 300 DSU/CSU Operator's Manual page 9

LAN Support
The Vanguard 300 features an onboard Ethernet interface that supports both
10BaseT and AUI. The factory default is AUI.
The Vanguard 305 features an onboard Token Ring interface. Support includes:
4 and 16 Mbps support
Type 1 STP (DB-9)
Type 3 UTP (RJ-45)
Frame Relay & X.25 Service
The Vanguard 300/305 provides serial devices with economical LAN access into
public or private Frame Relay WAN networks via Ethernet or Token Ring.
Because the Vanguard 300/305 also supports X.25, you can configure it as a PAD
if Frame Relay is not an immediate need. When Frame Relay service becomes
available, you can reconfigure the Vanguard 300/305 as a FRAD.
Multiprotocol Support
Support includes SDLC, Bisync, X.25, Async, IP/IPX, and Routing and Bridging,
as well as many other serial protocols.
Software Download
Trivial File Transfer Protocol (TFTP) provides software downloading for network
software and device configuration software.
RFC 877
RFC 877 encapsulation of IP datagrams over an X.25 network allows for
interoperability of Front End Processors (FEPs) that support X.25 and IP traffic as
well as router vendors supporting RFC 877/1356.