HP 3000 MPE/iX Computer Systems > Chapter 10 Technical Articles
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Communicator 3000 MPE/iX Release 6.0
(Platform Software Release C.60.00): HP 3000 MPE/iX Computer Systems > Chapter 10 Technical Articles 10.9: New Features for DTS/TIO Subsystem |
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Commercial Systems Division IntroductionThe Datacommunications and Terminal Subsystem (DTS) consists of host (HP 3000) based software and the DTC (Datacommunications and Terminal Controller) terminal server. The DTC family of products supports X.25 communication and Telnet access to HP 3000 systems, and TCP/IP communication to HP 9000 and non-HP systems. The DTS allows terminal, PCs in terminal emulation mode, serial printer, and other asynchronous devices to communicate with LAN-based hosts in HP-only and multivendor networking environments.New FeaturesThe DTS/TIO subsystem provides the following new functionality for MPE/iX 6.0 release:
Support of 400 DTCsUsers can now configure up to 400 DTCs on the HP 3000 host at a time. This is up from the earlier limit of 120 DTCs in MPE/iX 5.5 release. Thus the number of DTCs that can be connected to a HP 3000 is significantly increased. The maximum number of LDEVs supported on the HP3000 is still 4649. This means that if a high number of DTCs are configured then the DTCs can not have all ports configured as nailed ldevs. The total number of supported LDEVs can be spread over the configured DTCs in any way you want.Support of 2000 device classesA device class is a name that can be assigned to a single or a group of ldevs. This enables the user to refer to the ldev or the group of ldevs by a name. For example, the ldev associated with a tape driver is referred to as TAPE. Similarly, LP and DISK are the device classes for the system printer and disks respectively. The number of device classes supported has been increased from 1000 to 2000. This enhancement increased the flexibility for those users that need many devices classes.Three New Modem Types for AttachedTo give more flexibility, support has been added for three new modem types: US modem In Out, European modem In Out, and Five wires modem. However, these new modem types will be supported for the new types of DTCs only: DTC 72MX, DTC 16iX, and DTC 16MX. The complete list of supported modem types with MPE/iX 6.0 is:
Data Length/Parity List SupportWith MPE/iX release 6.0, you can now use NMMGR to configure the two new parity types in the Host-based terminal, printer and host profiles. These two new parity types are: 8 bits data length with even parity and 8 bits data length with odd parity. These parity settings were added in order to provide support for serial devices that need to use these settings. Devices that would use these need to be able to send and receive binary data and also need to check parity. These two new parity types are only supported for the newer DTCs: DTC 72MX, DTC 16iX, DTC 16MX and DTC 16RX. They are not supported for the DTC 48 or older DTCs. The full list of supported parity setting with MPE/iX release 6.0 is as given:
Number of stop bitsWith MPE/iX release 6.0, you can now configure the number of stop bits to be used for asynchronous characters in the host_based terminal/printer profiles. The possible values are 1 or 2 stop bits. This new configuration field will be supported for the new types of DTCs only: DTC 72MX, DTC 16iX, and DTC 16MX.Enable Flow ControlWhen TIO terminals, printers and host ports are created, one of the features that can be configured is a parameter that is sent to the port that determines the data flow control behavior between DTC port and connection device. With MPE/iX release 6.0, you can now use NMMGR to configure a parameter in the Host-based TIO profiles to enable or disable flow control. If this feature is enabled in NMMGR for terminal / printer, the data flow between the DTC port and the connection device is made with Xon/Xoff characters. If this feature is disabled, the XON/XOFF characters sent from device are not interpreted by DTC. This function is also known as "software handshake." This new feature can be supported on all DTCs except for DTC 16RX. Any value entered for this type will be ignored.Enable Keep AliveThis new feature allows you to specify whether "keep alive" mechanism is to be activated. When there is no data transfer between the DTC and the system, then a mechanism called "keep alive" is activated to detect if the connection is still there. This new feature is only applicable to the telnet/TCP connections. It is only available for switching screens for terminal, printer and host profiles. If this configuration is enabled, the "keep alive" mechanism is to be activated to detect if a connection is still there when there is no data transfer between the DTC and the system. This new feature can be supported on all DTCs except DTC48 without the memory extension.Save Port Config BinaryThis new feature allows you to specify whether the port configuration parameters- data length and parity get forced when binary mode is selected. If set to YES, then the port configuration remains the same when binary mode is selected. If set to NO, then data length is 8 bits and parity is forced to none when binary mode is selected. This new feature is only applicable to telnet/TCP connections. This parameter is accessed from the terminal and printer profile switching configuration screen and the host profile screen. This new feature can apply only to the new DTCs — DTC 72MX, DTC 16MX and DTC 16iX.Specify the Maximum Number of Sessions for a Switching PortHost-based terminal switching allows you to connect to other systems on the LAN from a terminal connected to a DTC that is using host-based management. In previous releases, each port on the DTC was restricted to one connection per port. Connections from PAD ports are still restricted to the system that is managing the DTC. To connect to these systems, you needed to log off or close the connection before connecting to an other system. With MPE/iX release 6.0, you can now use NMMGR to configure each DTC port to allow up to 5 connections at the same timer. If connections are to HP3000 systems using Host-based management, then only one connection is allowed to each system. This is because each system must configure the DTC port on a specific LDEV (nailed devices). If the connections are to HP3000 systems using PC-based management, then more than one connections is allowed. This is because it is allowed to configure the DTC port to use non-nailed LDEVs. If the DTC port on the PC-based system is configured as nailed, then only one connection is allowed to that system. This feature is configured on the terminal profile switching configuration screen. The maximum number of connections is five and the default is one.Number Of Hosts Sharing PrinterHost-based printer switching allows the serial printer connected to a DTC port to be shared by more than one HP 3000 host. You can now use NMMGR to configure the DTC port to allow a printer to be shared by up to 5 hosts. This feature is configured on the printer profile switching configuration screen. The maximum number of systems that can share at one time is 5 and default is 1. Thus the number of HP 3000 hosts that can share a printer is increased.Dynamic Configuration of New Port FieldsDynamic Configuration provides the capability to perform DTS/TIO configuration tasks without the need to shutdown the HP 3000 system. With MPE/iX release 6.0, you can now change the following new fields in a terminal, printer or host profile dynamically:
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