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Signaling System 7 (SS7)
Configuring an SS7 signaling gateway
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide Preliminary May 9, 2000 18-7
System IP address considerations
The System-IP-Addr parameter of the IP-Global profile specifies the source address of all
packets generated by the system, such as the connection request packets sent to a signaling
gateway to establish communication. When the Use-System-IP-Address-As-Source parameter
is set to yes (the default), the TAOS unit uses the system address as its source address in the
packets it sends to the signaling gateway.
Parameter Specifies
Device-ID Logical SS7 command control device where these values apply.
Currently, the settings in this profile apply only to the TAOS unit’s
operations. This parameter is currently not used.
T1-Duration Value of the acknowledgement (ACK) delay timer in
milliseconds. This timer specifies the maximum delay for an
acknowledgement when an information frame (I-frame) is
received. The default value is 1000 (1 second). The value must
be less than the T2 duration timer specified on the signaling
gateway. Valid values range from 0 to 2147483647.
T2-Duration Value of the transmission time-out timer in milliseconds. This
timer specifies how long this endpoint must wait for an
acknowledgement to a heartbeat frame. The default value is 3000
(3 seconds). The value must be greater than the T1 duration timer
on the signaling gateway. Valid values range from 0 to
2147483647.
T3-Duration Value of the persistent error timer in milliseconds. This timer
specifies the maximum duration of attempts to reestablish a link
before the transport layer flushes the data queues and sends an
error indication up. Default value is 30000 (30 seconds). Valid
values range from 0 to 2147483647.
Window-Size Maximum number of sequentially numbered data packets that can
be sent while pending acknowledgement at any given time.
Default value is 7. Valid values range from 1 to 63.
Ack-Threshold Threshold for triggering an acknowledgement (ACK) while
receiving data packets. As soon as the specified number of
packets is received, the TAOS unit sends an ACK back regardless
of the value of its T1 timer. The value of this parameter must not
be greater than the window size. Default value is 6. Valid values
range from 1 to 63.
Heartbeat
Enable/disable detection of a physical link failure, such as
disconnection of a cable or failure of the signaling gateway. When
the parameter is set to yes, the TAOS unit periodically sends out
heartbeat frames to the signaling gateway and waits for an
acknowledgement. If it does not receive an acknowledgement
within the number of milliseconds specified in its T2-Duration
timer, the TAOS unit resets the signaling link.