Dialogic DSI SS7MD manual Configuration, Runtime Operations

4 Dialogic® DSI SS7MD Board Configuration and Operation

4.6Monitoring

The monitoring option can be used in conjunction with the SS7 Development Package for the appropriate operating system (Linux or Solaris) to realize a high-performance protocol monitor with up to 4 boards, each monitoring a certain number of links (see the table in Section 2.3.1, “Run Modes” on page 15 for details).

When used in a passive monitoring mode, the DSI SS7MD Boards treat the signaling timeslot as an HDLC channel so, in addition to SS7, other flag-idle HDLC-based protocols may be monitored, for example LAPB, Q.931 (ISDN PRI) and DPNSS. The protocol to be monitored must have a minimum frame length (excluding flags) of 5 octets, a maximum of 278 octets, and use the CRC polynomial (x16 + x12 + x5 + 1). When operating in monitoring mode, the 3rd and successive identical frames may be filtered.

It is possible to configure monitoring and terminated SS7 links on the same signaling card.

4.6.1Configuration

The user needs to set up the configuration for the T1/E1/J1 interface and the operating parameters for each link to be monitored. This can be achieved using the config.txt file in conjunction with the s7_mgt configuration utility. Users wishing to use discrete message-based configuration should refer to Section A.2, “Monitoring Configuration Using Individual Messages” on page 180 of this manual.

4.6.2Runtime Operations

Once configured, whenever a frame is received, it is reported to the user’s application as an API_MSG_RX_IND or API_MSG_RX_INDT (timestamped) message.

During operation, the user may also read (and optionally reset) various statistics on a per-link basis by sending a Link Statistics Request (DVR_MSG_R_L1_STATS) message.

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