IPX/SPX Configuration and Management Manual

Protocol Interfaces and Services for NonStop™
IPX/SPX
IPX/SPX Configuration and Management Manual—425731-001
A-9
Other Services
Allocation Number
is used for flow control.
The minimum SPX packet size is 42 bytes, which consist of the 30-byte IPX header
plus the 12-byte SPX header. The maximum packet size is set by the higher-level
protocol layer (such as SPX or NCP). NonStop™ IPX/SPX imposes this limit on the
SPX packet size.
SPX Socket Numbers
SPX uses the IPX addressing scheme. In particular, the Network and Node fields of the
IPX address are shared physically and logically with SPX. However, the Socket field is
only physically shared; SPX sockets are independently assigned. Table A-4 shows SPX
socket numbers and their use.
Other Services
6530 Terminal Services
The Compaq terminal emulators allow communication between the workstation and the
host in one of two modes:
•
Conversational mode—Characters are sent to the host as you type them, one
character at a time. In general, conversational mode is used by operating system
applications, such as the command interpreter, that interact with terminals one
character at a time, one word at a time, or one line at a time,
•
Block mode—Data is sent to the host in blocks. In block-nonprotect mode, you can
move the cursor to any part of the screen and enter any type of data. In block protect
mode, the application divides the screen into fields; you can enter data only in
unprotected fields.
As a workstation user on the NetWare LAN, you also can access the operating system
through Telnet, an Internet-standard protocol for remote terminal connection service.
Telnet software must be installed on the workstation, and PC6530 Terminal Emulator
(PCT) or Outside View with Tandem Terminal Emulator (TTE) must be configured for
Telnet use. The NonStop™ Himalaya S-series host runs Telserv software, which
provides the Telnet protocol for remote connection service.
Table A-4. SPX Socket Number Use
Socket Numbers (in Hex.) Use
4000 - 4FFF Dynamic sockets used by SPX when an application binds
7000 - 70FF Telserv listener
7100 - 71FF Open Database Connectivity (ODBC) listener
7200 - 72FF Remote Server Call (RSC) listener
8000 - FFFF Static sockets, assigned by Novell