GB/T 7620-1987 in English
VALID300 bits per second duplex modem standardized for use in the general switched telephone network
- Issued on:1987-04-03
- Implemented on:1987-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
Price(USD)：
$120.00
$117.00
$117.00
| Standard No: | GB/T 7620-1987 |
| Document status: | VALID |
| Title in English: | 300 bits per second duplex modem standardized for use in the general switched telephone network |
| Title in Chinese: | 在电话自动交换网上使用的标准化300比特/秒全双工调制解调器 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 1987-04-03 |
| Implemented on: | 1987-11-01 |
| Chinese Classification: | M32-Data communication equipment |
| Professional Classification: | GB-National Standard |
| Related Keywords: | telephone network scopethis modem
second duplex modem automatic telephone modem telephone |
| Related Topics: | full duplex
modulation ratio switching network femtosecond up-conversion technology femtosecond upconversion GBT7620 |
《GB/T 7620-1987在电话自动交换网上使用的标准化300比特/秒全双工调制解调器》由339-2（工业和信息化部（通信））归口，主管部门为工业和信息化部（通信）。
本标准等效采用国际电报电话咨询委员会CCITT建议V.21(1984)《在电话自动交换网使用的标准化300比特/秒全双工调制解调器》。
Scope
This modem is designed for use on automatic telephone switching networks, and it can also be used on leased lines.
Sample only — not a preview of GB/T 7620-1987
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