Table of Contents - K.12 (08/2024) - Characteristics of gas discharge tubes for the protection of telecommunication installations

1	Scope
2	References
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Recommendation
4	Abbreviations and acronyms
5	Conventions
6	Storage conditions
7	Electrical requirements
	7.1	Sparkover voltages (see clause 8.1)
	7.2	Insulation resistance (see clause 8.2)
	7.3	Capacitance
	7.4	Transverse voltage
	7.5	d.c. holdover voltages (see clause 8.5 and Figures 4 and 5)
	7.6	Life tests (see clause 8.6)
	7.7	Short-circuit behaviour
8	Test methods
	8.1	Sparkover voltage
	8.2	Insulation resistance
	8.3	Capacitance
	8.4	Impulse transverse voltage for 3-electrode gas discharge tubes
	8.5	Holdover test
	8.6	Life tests
	8.7	Short-circuit test
9	Environment tests
	9.1	Radiation
	9.2	Robustness of terminations
	9.3	Solderability
	9.4	Resistance to soldering heat
	9.5	Vibration
	9.6	Damp heat cyclic
	9.7	Sealing
	9.8	Low temperature
10	Informative characteristics
11	Identification
	11.1	Marking
	11.2	Documentation
	Page
12	Ordering information
Annex A – Test circuit for GDT used in ISDN circuits
Annex B – Sparkover test waveform
Annex C – Determining the special test protector (STP)