Digital Equipment RapidPrint 500, Reference Manual

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Concepts Network Protocols
2 - 1
2 - Concepts
The RapidPrint 500 supports incoming connections to services, such as printer support.
Services are the basic method of connecting to the RapidPrint 500 from any host or another server.
In general, a service is required on the RapidPrint 500 before any job or connection queueing will
take place. See the
Server Configuration chapter for details on creating and using services on the
RapidPrint 500.
2.1 Network Protocols
A network protocol describes the data contained in Ethernet packets. The network protocols pro-
vided by the RapidPrint 500 are completely separate, other than the use of the Ethernet data layer.
The following figure shows the protocol stacks supported by the RapidPrint 500.
Figure 2-1: RapidPrint 500 Network Protocols
There are three different “Ethernet” frame formats, one of which is subdivided:
• What is typically called “Ethernet” is technically referred to as Ethernet
v2. This is the default frame type for most TCP/IP, LAT, and MOP/
NCP protocol stacks. It can also be used for NetWare.
• The IEEE 802.3 frame format comes with either a regular or SNAP SAP
(Service Access Point). AppleTalk uses the SNAP format by default.
Both types can be used by NetWare.
• NetWare 2.x and 3.x stations, by default, do not use any of these frame
types. They use a “native mode” format that is being phased out.
AppleTalk LAN Manager LAT NetWare TCP/IP
Printer Access
Protocol SMB LAT NCP Telnet/ Rlogin/
RTEL/ lpd
ATP NetBEUI SPX TCP
DDP IPX IP
Ethernet/IEEE 802.3 Data Layer