gtpd2m22 | Data Communications Services Reference |
The type of BSC lines used is determined by user requirements (existing networks, line tariffs, geographical locations, etc.) as modified by the following restrictions imposed by the TPF system.
The BSC protocol supported by the TPF system is as described in General Information - Binary Synchronous Communications, GA27-3004-2, with the following exceptions. TPF does not support:
The TPF system may be defined as a terminal to a control point through the use of lines controlled by the BSC protocol. In this case the TPF system acts as a point-to-point station, a multipoint control station or a multipoint tributary station. The line code on each line can be EBCDIC transparent, EBCDIC nontransparent or USASCII nontransparent. This allows the TPF system to be attached to leased lines or in-house BSC lines connected to a MVS system in a variety of network configurations. Several BSC lines can be used as a link between stations if desired. That is, a group of lines can be treated as an entity and the TPF system will queue output messages on the line with the smallest queue. Also, if an individual line goes down, all output messages will be rerouted to another line in the link.