Professional Standard - Post and Telecommunication
Status
2009-12
Latest
YD/T 675-1994
Scope
This standard specifies the quality level and quality level requirements of digital program-controlled user telephone exchanges. This standard applies to digital program-controlled user telephone exchanges and is the highest level basis for assessing the quality of digital program-controlled user telephone exchanges. This standard does not apply to product sorting.
YD/T 675-1994 history
1994YD/T 675-1994 Quality grading criteria of digital SPC private branch exchanger