Existing IBM program products, TCPIIP for DOS and TCPIIP for OS/2*, provide TCP/IP support for intelligent workstations. These workstations may be attached using a Token-Ring, IBM PC Network, Ethernet, 3174 Peer (LAN over COAX), or Asynchronous Serial Line Internet Protocol (SLIP). 3174 TCP/IP Telnet support, provides TCP/IP host access to CUT and ASCII terminals directly attached.
This chapter describes the 3174 TCP/IP Telnet Support, including the 3174 models supported, the customization required, and operational aspects of this capability. This chapter uses material from the following document:
• 3174 TCP/IP Telnet RPQ Diskettes Installation Instruction (provided with the RPQ 8Q0935 package).
The 3174 TCP/IP Enhancements RPQ 8Q1041 and Configuration Support-C Release 5 enhancements are described, in later chapters.
2.1 Support before 3174 TCP/IP Telnet RPQ 8Q0935
With the addition of the Peer Communication LlC feature or the Peer Communication RPQ 8Q0718 in a 3174 that is attached to a Token-Ring, the intelligent workstations can be coax-attached to the 3174 and participate in TCP/IP networking. For this configuration, the workstations require the appropriate LAN-Over-Coax device drivers provided by the following:
• For DOS, Workstation Peer Communication Support Program
• For OS/2, Extended Services, OS/2 LAN Server or NTS/2 Note:
The DOS Workstation Peer Communications Support Program has been replaced with the NOIS compliant driver, IBMXLN.DOS.
The 3174, in this instance, provides nothing more than an internal ring and an internal bridge to allow the coax-attached workstations access to the
Token-Ring; it has no TCPIIP capability and dependent (CUT, DFT-E or ASCII) terminals attached to the 3174 cannot participate in TCP/IP networking.
The TCP/IP hosts to be accessed by the intelligent workstations may be attached directly to the same Token-Ring, or they may be accessible through the
Token-Ring via bridges or routers.
2.2 Support with 3174 TCP/IP Telnet RPQ 8Q0935
With the announcement of the 3174 TCP/IP Telnet RPQ 8Q0935 and Configuration Support-C Release 2 in March 1992, a new capability was added to a Token-Ring attached 3174: the 3174 could now be customized to provide TCPIIP Telnet client services to allow dependent (CUT, DFT-E or ASCII) terminals attached to the 3174 to communicate with TCP/IP Telnet servers.
With the 3174 TCPIIP Telnet RPQ 8Q0935, a dependent (CUT, DFT-E and ASCII) terminal attached to the 3174 can establish a TCP/IP Telnet connection with a TCP/IP hosVserver anywhere in the existing LAN/WAN network. The TCP/IP
@ Copyright IBM Corp. 1994 9
hosts to be accessed by the dependent terminals may be attached directly to the same Token-Ring, or they may be accessible through the Token-Ring via bridges or routers.
Each terminal user can have up to five logical terminals (L Ts) if Multiple Logical Terminal(MLT) is customized. These five LTs can be used to access 3270, ASCII or TCP/IP host sessions; that is, all five LTs may be used to access five 3270 host sessions, or five ASCII host sessions, or five TCP/IP host sessions, or some combination of 3270, ASCII and TCP/IP host sessions. The desired host
connection can be selected by means of the Connection. Menu, or established by default. Any LT can be used to access the TCP/IP "pipe," very much the same way that a dial-out AEA port is accessed. For each TCP/IP LT, a simple set of commands allows the user to request and operate a session with any TCP/IP host in the network.
As seen above, the 3174 TCP/IP Telnet RPQ 8Q0935 works in conjunction with MLT and AEA functions. You can also use the 3174 TCP/IP Telnet RPQ 8Q0935 concurrently with all other functions that a given 3174 is capable of, such as Peer Communication and APPN*.
2.3 Support with Configuration Support-C Release 3
In May 1993, Configuration Support-C Release 3 was announced. Its base microcode includes the base functions of previous releases of 3174 Licensed Internal Code. In addition, the functions provided by the 3174 TCP/IP Telnet RPQ 8Q0935 are now integrated in the base functions of Configuration Support-C Release 3. This integrated capability is referred to as the 3174 TCP/IP Telnet Support in this document.
In other words, the TCP/IP capabilities provided by the 3174 TCP/IP Telnet RPQ 8Q0935 are now provided by Configuration Support-C Release 3 base microcode.
2.4 Support with 3174 TCP/IP Enhancements RPQ 8Q1041
In May 1993, Configuration Support-C Release 4 was also announced. Included in this announcement was the 3174 TCP/IP Enhancements RPQ 8Q1041, which will provide TN3270 support, TCP/IP dependent host printer support, and SNMP MIB-II support. This RPQ, was made available April 1994, and is based on Configuration Support-C Release 4. With RPQ 8Q1041, therefore, the TCP/IP capabilities of the 3174 are extended even further.
2.5 Support with Configuration Support-C Release 5
. Configuration Support-C Release 5 and frame relay support expands the 3174 connectivity for 3174 TCP/IP support. Prior to Configuration Support-C Release 5 all TCP/IP access to and from the 3174 assumed LAN (token-ring or Ethernet).
With Configuration Support-C Release 5, you are able to telnet to TCP/IP host in the network via frame wide area network links. As of the publication date of this document, 3174 TCP/IP Enhancements RPQ8Q1041 was not available for
Configuration Support-C Release 5.
2.6 Support with 3174 IP Forwarding RPQ 8Q1289
3174 IP Forwarding RPQ 8Q1289 enables intelligent workstation that are not directly attached to the 3174 using Peer Communications, access to TCP/IP hosts via the 3174 the frame relay link(s). The 3174 actually, provides static IP routing for LAN (token-ring or Ethernet) attached intelligent workstation running as TCP/I P hosts.
2.7 TELNET Emulation and NLS Support
The 3174 TCP/IP Telnet Support allows CUT terminals to have up to five TELNET sessions. The supported emulators for National Language Support (NLS) are:
• VT100
• VT220 7 -bit
Note: IBM3101, DG210 and VT220 8-bit emulation are not supported for NLS In our scenario, we have tested NLS for the German and Canadian/Bilingual languages. In TELNET session with the RISC System/6000, we use the SMIT (Systems Management Interface Tool) facility.
German NLS experience:
• VT100 emulation:
- All PF keys useable.
- Use Alt instead of Esc key.
• VT220 7-bit emulation:
SMIT panel displays OK.
All PF keys usable.
Canadian/Bilingual NLS experience:
• VT100 emulation:
All PF keys, except the PF8, PF9 and PF10 keys, are usable.
PF8, PF9 and PF10 keys only capable in conjunction with Esc key.
Use Alt instead of Esc key.
• VT220 7-bit emulation:
SMIT panel displays OK.
All PF keys usable.
Note: If you are using a PS/2· with a 3270 CUT mode emulation program, you have to respond to 3174 customization Question 168 with 1. This function allows you to define the Home key as hot key.
Using this emulation will require you to define some additional keys. For more information about the different keyboard maps, see Terminal User's Reference for Expanded Functions, GA23-0332.
Chapter 2. 3174 TCPIIP Telnet Support 11