System information

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AS/400 IBM Network Station: Techniques for Deployment in a WAN
C.2.1.1 Understanding IP Address Requirements
Obtaining contiguous IP addresses may be difficult. Be prepared by obtaining
extra addresses for future use.
Valid Internet protocol (IP) addresses must meet the following criteria:
• Four decimal numbers separated by periods.
• Number one must be greater than or equal to 1 and less than or equal to
223.
• Numbers two, three, and four must be greater than or equal to zero (0) and
less than or equal to 255.
• All IP addresses must be unique.
• The IP Address must not equal the Net Address
• IP Address must not equal the Broadcast Address
C.2.2 ISDN Modems
If you use an ISDN modem with your 5500 control unit for dial-up WAN
connectivity, additional configuration is necessary. Parameters, such as
Switch Type, Service Profile IDs (SPIDs), Directory Numbers (DNs), Terminal
End-point Identifiers (TEIs), and Call Type, must be entered and saved on
your ISDN modem. Typically, these fields can be configured using the AT
command set or software provided with your ISDN modem. Because these
parameters must be set prior to connecting the modem to the 5500 control
unit, IBM recommends that you use a personal computer (PC) or other
RS-232 capable device to configure these parameters. Attach the ISDN
modem the 5500 control unit.
Consult the documentation provided with your ISDN modem for more details
on the parameters required by your modem and the steps necessary to
configure them.
C.3 5500 Control Unit and TCP/IP LAN Concepts
The most common configurations for the IBM 5500 Express IP control unit
are:
• The AS/400 system is connected through the WAN interface with the LAN
connected using Ethernet or token-ring interface. Workstations on LAN
are twinax-attached workstations (either Network Stations or PCs with
5250 Express emulation adapters).