Browse Prior Art Database

3275 Dial SNA Gateway Facility

IP.com Disclosure Number: IPCOM000060206D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Cohen, A: AUTHOR [+4]

Abstract

The 3275 Dial SNA Gateway facility supports 3275 devices and emulators. The 3275 device/emulator consists of a display and, optionally, a printer attached to it. Therefore, to the SNA network the Gateway appears as an SNA Physical Unit (PU) type 2 cluster with 3278 display (LU2) and 3287 printer device (LU1 or LU3) attached to it. These two logical units (3278 display and 3287 printer) will be mapped into one 3275 dial BSC port on an IBM Series/1 machine. A unique feature of the Dial Gateway is the use of different BSC ID's to specify both the device type and the operating mode. The BSC ID of "fS1B" identifies the device as a 3275 emulator and selects the operating mode that is referred to as FULL SCREEN mode.

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3275 Dial SNA Gateway Facility

The 3275 Dial SNA Gateway facility supports 3275 devices and emulators. The 3275 device/emulator consists of a display and, optionally, a printer attached to it. Therefore, to the SNA network the Gateway appears as an SNA Physical Unit (PU) type 2 cluster with 3278 display (LU2) and 3287 printer device (LU1 or LU3) attached to it. These two logical units (3278 display and 3287 printer) will be mapped into one 3275 dial BSC port on an IBM Series/1 machine. A unique feature of the Dial Gateway is the use of different BSC ID's to specify both the device type and the operating mode. The BSC ID of "fS1B" identifies the device as a 3275 emulator and selects the operating mode that is referred to as FULL SCREEN mode. In this mode of operation, data that is to be sent to the emulator is buffered in the gateway until all of the data required to present an entire screen is available. The data is then assembled into a single BSC block for transmission to the emulator. This mode is useful for devices that require time to act on the receive data before receiving more data. The BSC ID of "fccc" where ccc represents any three EBCDIC characters will cause the emulator to operate in SEGMENTED MODE. In this mode the data is transmitted to the device as it is received from the host application. This results in multiple short blocks being transmitted to the device rather than one large block. The multiple short blocks reduce the probability of transmis...