EasyManuals Logo

3M Dynatel 955 User Manual

3M Dynatel 955
99 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #96 background imageLoading...
Page #96 background image
APPENDIX
Appendix 1
Appendix
Generally Accepted Criteria for Plain Old
Telephone Service
Parameter Acceptable Marginal Unacceptable
Loop Current mA 23
2
20< 23
2
<20
1,
2
Circuit loss dBm 8.5 >8.5
Metallic Noise dBrnC
20 >20< 30 30
Power Influence dBrnC
80 >80<90 90
Balance dB
60 >50<63 50
*Station Ground Ohms
25 ––– > 25
Slope dB
7.5 ––– > 7.5
Parameter Insulation Light Fault Heavy
Good (Service Fault
Affected)
3
(Out of
Service)
Insulation
Resistance
3.3 MOhms >2.8 kOhms 2800 Ohms
< 3.3 MOhms
1
These are negative values.
2
>18 to <20 mA acceptable for emergency service only.
3
Lines having good insulation but equipped with ringer
isolators or selective ringing devices will test as having light
faults on tip and ring.
NOTE: > means “more than”
means “more than or equal to”
< means “less than”
means “less than or equal to”
* On some floatingĆtip switches, such as #5 ESS, ground
resistance cannot be measured because the switch
operates on a floating ground.

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the 3M Dynatel 955 and is the answer not in the manual?

3M Dynatel 955 Specifications

General IconGeneral
Brand3M
ModelDynatel 955
CategoryTest Equipment
LanguageEnglish

Related product manuals