Welltech Dialogic SS7 Protocols ISUP Instrukcja Użytkownika Pobierz pdf (Strona 199)

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SS7 Protocols ISUP Programmer's Manual Issue 15

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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).

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Welltech Dialogic SS7 Protocols ISUP Instrukcja Użytkownika Strona 199