Welltech Dialogic SS7 Protocols ISUP - Manual (Page 199)

Dialogic ® SS7 Protocols ISUP Programmer's Manual Issue 15
199
Appendix F: Timer Services
The notion of time in the ISUP module is based on a periodic timer tick
received from the timer module every 100ms. This ‘tick’ is used to run all
ISUP protocol timers. This appendix details the messages format which are
used by the ISUP module to control timer services.
F.1 Keep Time
Message sent to request the timer module to issue a periodic timer tick
(TM_EXP) message to the ISUP module.
Message Header
structure MSG
type KEEP_TIME (0x7006)
id 0
src Sending module’s ID
dst Timer module ID
rsp_req 0
hclass 0x00
status 0x00
err_info 0x00
len 6
Parameter Area
offset 0, size 2: Reserved Should be set to zero if issued by the user and
discarded when received by the timer module. parameters
offset 4, size 2: resolution
Parameters
resolution
The number of operating system ticks between timer expiry messages being
issued to the ISUP module. This parameter is set from the timer_res
parameter in the ISUP module configuration message ( Section : 8.1 Configure
Request on page 121 ).