Example: Create parallel connections to a host

This example connects your system to a host system through a 3745 Communications Controller by using parallel connections.

Each connection has a separate instance of the logical link control and a separate bandwidth. Thus, communications can still occur even if one link becomes nonfunctional.

Because all the examples use the same token-ring line description, this example discusses only the controller and device descriptions. You can find the configuration for the 3745 controller in Example: Configure the physical and logical parallel connections on the host system.

Controller descriptions:

In this example, focus on these points:

The controller descriptions use the same line description.
The controller descriptions use different local exchange IDs. You must use exchange IDs to establish parallel connections.
The controller descriptions use different source service access points (SSAPs).
The 3745 Communications Controller requires that you specify 04 for the destination service access point (DSAP).

CRTCTLHOST CTLD(CTL_1A) LINKTYPE(*LAN) APPN(*NO)
           SWTLINLST(TOKENRING1) LCLEXCHID(056A001A)
           ADPTADR(400000001592) DSAP(04) SSAP(04)
           TEXT('Controller for the first link')

CRTCTLHOST CTLD(CTL_2A) LINKTYPE(*LAN) APPN(*NO)
           SWTLINLST(TOKENRING1) LCLEXCHID(056A002A)
           ADPTADR(400000001592) DSAP(04) SSAP(08)
           TEXT('Controller for second link')

Device descriptions for CTL_1A:

These commands create the device descriptions that are used with the CTL_1A controller description:

CRTDEVDSP DEVD(DSPA001A02) DEVCLS(*RMT) TYPE(3279) MODEL(0)
          LOCADR(02) CTL(CTL_1A) APPTYPE(*NRF)
          TEXT('NRF device, LOCADDR 02')

CRTDEVDSP DEVD(DSPA001A03) DEVCLS(*RMT) TYPE(3279) MODEL(0)
          LOCADR(03) CTL(CTL_1A) APPTYPE(*NRF)
          TEXT('NRF device, LOCADDR 03')

CRTDEVHOST DEVD(EMLA001A04) LOCADR(04) RMTLOCNAME(SWXIDA04)
           CTL(CTL_1A) APPTYPE(*EML)
           TEXT('Emulation display, LOCADDR 04')

CRTDEVPRT DEVD(PRTA001A05) DEVCLS(*RMT) TYPE(3287) MODEL(0)
          LOCADR(05) CTL(SWTRNCTL1A) APPTYPE(*NRF)
          LOGON('LOGON APPLID(NRF2A07) LOGMODE(SCSTRYR)')
          TEXT('NRF printer, LOCADDR 05')

Device descriptions for CTL_2A:

These commands create the device descriptions that are used with the CTL_2A controller description:

CRTDEVDSP DEVD(DSPA002A02) DEVCLS(*RMT) TYPE(3279) MODEL(0)
          LOCADR(02) CTL(CTL_2A) APPTYPE(*NRF)
          TEXT('NRF device, LOCADDR 02') 

CRTDEVHOST DEVD(EMLA002A04) LOCADR(04) RMTLOCNAME(SWXIDB04)
           CTL(CTL_2A) APPTYPE(*EML)
           TEXT('Emulation display, LOCADDR 04') 

CRTDEVPRT DEVD(PRTA002A05) DEVCLS(*RMT) TYPE(3287) MODEL(0)
          LOCADR(05) CTL(CTL_2A) APPTYPE(*NRF)
          LOGON('LOGON APPLID(NRF2A07) LOGMODE(SCSTRYR)')
          TEXT('NRF printer, LOCADDR 05')