| Standard No. |
Title |
Price(USD) |
Delivery |
Status |
Add to Cart |
| GB/T 4574-1984 |
Measuring methods for actual circuit noise and the circuit noise in simulating system loading over the analogue communication network |
$340.00 |
via email in business day |
abolished2005-10-14 ,,1985-4-1 |
|
| GB/T 4827-1984 |
Requirements of data transmission at 50 bit/s |
$130.00 |
via email in 1~3 business day |
abolished2005-10-14,,1985-10-1 |
|
| GB/T 5437-1985 |
Document facsimile (group 3) transmission requirement |
$120.00 |
via email in 1~3 business day |
valid,,1986-6-1 |
|
| GB/T 5438-1985 |
Characteristics and measuring methods for monophonic and stereophonic transmissions |
$180.00 |
via email in 1~3 business day |
valid,,1986-6-1 |
|
| GB/T 5442-1985 |
The test methods for the technical specifications of inband pulsing single frequency line signalling system for automatic telephone switching network |
$120.00 |
via email in 1~3 business day |
valid,,1986-6-1 |
|
| GB/T 5443-1985 |
The test methods for the technical specifications of ringing and tone for automatic telephone switching network |
$244.00 |
via email in 1~3 business day |
valid,,1986-6-1 |
|
| GB/T 5444-1985 |
The test methods for the technical specifications of subscriber line signalling for automatic telephone switching network |
$244.00 |
via email in 1~3 business day |
valid,,1986-6-1 |
|
| GB/T 5581-1985 |
Specification and measuring method of frequency-modulated voice-frequency telegraph set for a modulation rate of 75 Bauds with channels spaced at 180 Hz |
$260.00 |
via email in 1~3 business day |
abolished2005-10-14 ,,1986-7-1 |
|
| GB/T 6363-1986 |
Method for the subjective assessment of the quality of document facsimile |
$110.00 |
via email in 1~3 business day |
valid,,1987-5-1 |
|
| GB/T 6879-1995 |
Performance and test methods of the 30 channels pulse code modulation multiplex equipment at 2048 kbit/s |
$720.00 |
via email in 1~3 business day |
valid,,1996-8-1 |
|
| GB/T 7254-1995 |
Performance and test methods of the second order digital multiplex equipment operating at 8448 kbit/s and using positive justification |
$270.00 |
via email in 1~3 business day |
valid,,1995-1-2 |
|
| GB/T 7436-1987 |
of TDM equipment operating on analog telephone-type circuit for telegraph and lower-speed data |
$240.00 |
via email in 1~3 business day |
valid,,1987-1-1 |
|
| GB/T 7438-1987 |
Numbering for telex and low speed data in national communication network |
$180.00 |
via email in 1~3 business day |
abolished2005-10-14 ,,1987-1-1 |
|
| GB/T 7440-1987 |
Calculating methods and measuring methods for transmission parameters of open-wire communication lines |
$410.00 |
via email in 1~3 business day |
abolished2005-10-14 ,,1987-1-1 |
|
| GB/T 7554-1987 |
5-unit numerical code for telegram service |
$184.00 |
via email in 1~3 business day |
valid,,1987-1-1 |
|
| GB/T 7555-1987 |
General characteristics complying with the network performance objectives for 12 channel carrier telephone systems on open-wire pairs |
$220.00 |
via email in 1~3 business day |
abolished2005-10-14 ,,1987-1-1 |
|
| GB/T 7556-1987 |
General characteristics complying with the network performance objectives for 60 channel carrier telephone systems on symmetric cable pairs |
$260.00 |
via email in 1~3 business day |
abolished2005-10-14 ,,1987-1-1 |
|
| GB/T 7557-1987 |
General characteristics complying with the network performance objectives for 300 channel carrier telephone systems on standardized 1. 2/4. 4mm coaxial cable pairs |
$180.00 |
via email in 1~3 business day |
abolished2005-10-14 ,,1987-1-1 |
|
| GB/T 7585-1987 |
series and radio-frequency channel arrangement for analog microwave relay systems |
$150.00 |
via email in 1~3 business day |
valid,,1987-1-1 |
|
| GB/T 7609-1995 |
General test method for transmission performance of PCM voice channel in telecommunication network |
$210.00 |
via email in 1~3 business day |
valid,,1996-6-1 |
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