Semipermanent connection refers to the transmission channel comprised of some idle timeslots in the existing network. The semipermanent connection is used to transfer business hall information, alarm information about the BTS AC power supply, and other maintenance information.
When the network operator needs to transmit some data from one terminal to another terminal and the data does not have a high requirement for the transmission bandwidth, the idle transmission resources in the GSM network can be specially used to transfer the data.
Semipermanent connection is a transparent channel that can be used to transmit information specified by a subscriber. The BSC provides the semipermanent connection of four rates: 8 kbit/s, 16 kbit/s, 32 kbit/s, and 64 kbit/s.
There are two types of semipermanent links in the BSS system:
Semipermanent connection
Connection configured between interface boards.
Monitoring timeslot
Connection configured between the interface board and the BTS. The rates of monitoring timeslots are 8 kbit/s, 16 kbit/s, 32 kbit/s, and 64 kbit/s. You can assign multiple monitoring timeslots for the BTSs on a link at a time.