Signaling is a process for ATM users and network switched control information, requesting network resource usage or negotiation circuit parameters. Once the signaling is swapped, VPI / VCI is assigned and request bandwidth. The transmission of information is done on the signaling ATM adaptation layer SAAl, which ensures the reliability of the transmitted. SAAL is divided into service specific partial and universal parts, while specific portions can further divide service specific tuning functions SSCF and service specific face-oriented protocol SSCOP, the former is used to connect users, which are used to ensure reliable transmission.
The UNI signaling protocol in SAAL is responsible for ATM calls and connection controls, including call setup, call cancel, status query, and point-to-point control. The ATM UNI signaling information uses the Q.931 information format, which consists of one information head and one information element variable serial number.
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