A processor is identified by the following three pieces of information:
processor name for BCAM (for connection setup or clear-down)
host name for applications
system identification (SYSID) within certain applications.
Processor name
A processor name is a local representative of a partner processor. An address is assigned to the processor name by BCAM under which the partner processor is addressable in the network. Although this address is uniquely assigned to a processor, a processor can have more than one address (processor name).
Two processors can therefore know a third processor under different processor names (at the same point in time). Furthermore, a processor can also change its address in relation to a partner processor within a certain period of time. The processor name does not therefore guarantee the unambiguous identification of a processor (or more precisely a BS2000 session) within a network and over a period of time. This is why the host name exists.
Host name
The host name of a processor is the name of the own BS2000 system. It is specified in the DCSTART or DCOPT command when BCAM is started; it is not possible to start BCAM without assigning the host name.
During startup of HIPLEX MSCF, the communication system determines this name and uses it as the host name for that MSCF session.
The host names of the processors to be linked in the network must be unique. In other words, a processor cannot have MSCF connections to different partner processors at the same time with the same host name.
System identification (SYSID)
The SYSID of a processor is read out of the standard volume label (SVL) of the home pubset at BS2000 startup and is thus defined for the current BS2000 session. This means that a SYSID modified during a BS2000 session (via the SET-PUBSET-ATTRIBUTES command for the home pubset) does not become effective until the BS2000 is started up again with the same home pubset.
The following values are permissible for SYSIDs: A-Z, 0-9 and 65-192 (default value: 250).A processor with SYSID 250 cannot participate in an MSCF network.
The SYSIDs of the processors to be linked must be unique, i.e. a processor cannot have MSCF connections to different partner processors at the same time with the same SYSID.