9 received message timestamping, 1 host configuration, 2 timestamp output – Dialogic DSI SS7MD User Manual
Page 39: Received message timestamping 4.9.1, Host configuration, Timestamp output, Received message timestamping
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Dialogic
®
DSI SS7MD Programmer’s Manual Issue 3
4.9
Received Message Timestamping
Timestamping of received messages can be enabled for monitored links. This functionality provides a
timestamp of the time a message is received by a board. Individual boards maintain time by synchronising
with the host time.
The following table provides details of the expected timestamp accuracy between boards, in a multi board
system:
4.9.1
Host Configuration
The host must be configured to enable timestamping as follows:
1. Configure the LIU to operate in high-impedance mode using the <liu_type> parameter in the
command, which has the following format:
LIU_CONFIG <brd_id> <liu_id> <liu_type> <line_code> <frame_format> <crc_mode>
For example, to configure E1 high-impedance mode, use the command:
LIU_CONFIG 0 0 6 1 1 1
2. Configure receive only monitoring links using the
command in the config.txt file, which
has the following format:
MONITOR_LINK <link_id> <board_id> <blink> <stream> <timeslot> <user_module>
<filter> <flags> <phys_mask>
Timestamping is disabled by default. To enable timestamping on the monitored link, set bit 0 in the
<flags> field to 1. For example:
MONITOR_LINK 0 0 0 0 1 0xef 7 0x01 0xff
3. Configure the s7_log utility to display board and/or host timestamp information. See
for more information on the command line options for timestamping.
Note: To use the s7_log utility to display timestamps, monitoring messages must be redirected to the
s7_log module ID in the
4.9.2
Timestamp Output
Once timestamping is enabled, a timestamped
message is issued by the board instead of
an
message. These messages are sent to the user module configured in the
The following are examples of messages without timestamping enabled:
S7L:I0000 M t8f01 i0000 f00 def s00 pffff0103
S7L:I0000 M t8f01 i0000 f00 def s00 pffff0103
The following are examples of messages with timestamping enabled:
S7L:I0000 M t8f0f i0000 f00 def s00 pffff01037caa8ec4e90f2abf
S7L:I0000 M t8f0f i0000 f00 def s00 pffff01037caa8ec4c3976bbf
If the decoding of the timestamps is enabled in the s7_log utility, the output look like the following:
S7L:2001-11-20 15:17:01.012 BRD:2001-11-20 15:17:01.011 I0000 M t7e20 i0000 f0d def s00 p00030001006000
Operating System
Measured Accuracy
Linux
1 ms
Solaris
2 ms