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Signaling System No. 7 (SS7/C7): Protocol, Architecture, and Services by Jeff Hewett, Lee Dryburgh

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Appendix G. MTP Timers in ITU-T/ETSI/ANSI Applications

This appendix defines all MTP timers used in ITU-T, ETSI, and ANSI specifications. ITU-T timer values are specified in ITU-T Q.704 [53]. ETSI timer values are specified in ETSI EN 300 008-1 [9]. ANSI timer values are specified in T1.111-2001 [1].

Message Transfer Part 2 Timers

Table G-1 lists the Message Transfer Part 2 (MTP2) timers.

Table G-1. MTP2 Timers

Timer

Use

Range

Note: ETSI [9] timers are identical to ITU-T timers.

T1

Timer “aligned/ready”

40–50 s (ITU-T 64 kbps)

12.9–16 s (ANSI 56/64 kbps)

170 s (ANSI 1.5 mbps)

T2

Timer “not aligned”

5–50 (low) s (ITU-T 64 kbps)

70–150 (high) s (ITU-T 64 kbps)

25–350 s, 300 s nominal (ITU-T 1.5/2 Mbps)

5–14 (low) s, nominal 11.5 s (ANSI 56/64 kbps)

16–30 (high) ...

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