Specifications

4 Message Reference
30
ssf - sub-service field
The value used in the sub-service field of all messages generated by level 3. Must be in
the range 0 to 15. For ANSI operation, the 2 least significant bits must be set to 1.
up_enable - User Part Enable
A 16 bit mask used to enable or disable reception of messages on a per user part
basis. If bit N is set to 1, then messages for user part N are received by the signaling
point.
For example, to enable the TUP User Part (Service indicator = 4) set the up_enable
field to 0x0010, For ISUP (Service Indicator = 5), set the up_enable field to 0x0020.
To use both TUP and ISUP, set up_enable to 0x0030.
linkn_flags - Per link flags
Bit 0 is set to 1 to force the use of the emergency proving period during link
alignment. This bit is usually set to zero and uses the appropriate proving period
according to Q.703.
Bit 1 is set to 1 to cause a signaling link test (in accordance with ITU-T Q.707) to be
carried out before a link is put into service, or zero if a test is not required. This bit is
usually set to 1.
Bit 2 is set to 1 to cause a signaling link test (in accordance with ITU-T Q.707) to be
carried out every 30 seconds. This bit is usually set to 1, but is ignored if Bit 1 is set to
zero.
Bit 8 is used to select the MTP2 error correction mode. It is set to 1 to select PCR
(Preventive Cyclic Retransmission) operation, or zero for the Basic Method of Error
Correction.
Bits 10 and 11 are used to select the data rate for the link as detailed below.
Bit 11
Bit 10
Data Rate
0
0
64kbps
1
1
56kbps
0
1
48kbps
Note: When using a serial port, 56 kbps and 48 kbps operation is only supported when the clock is
applied externally.
Bit 12 when set MTP2 links are configured individually via SS7_MSG_CONFIG.
Bit 13 is only used when the link has been configured to run over a serial port (i.e., bit
14 is set). If set to 1, an external clock is used (Receive clock). If set to zero, an
internal clock (Transmit clock) is used. If the link has not been configured to run over a
serial port, this bit must be set to zero.
Bit 14 is set to 1 to use a serial port, rather than a PCM timeslot for this link. In this
mode the stream and timeslot parameters for this link are ignored (and must be set to
zero). If this bit is set to zero, the link uses the specified stream and timeslot. The
serial port used by the signaling processors for each link is fixed, according to the
following table: