t7345s 发表于 2015-1-1 19:21:44

ETSI EG 201 188 V1.1.1 (1999-06)

EG 201 188 V1.1.1 (1999-06)
ETSI Guide
Public Switched Telephone Network (PSTN);
Network Termination Point (NTP) analogue interface;
Specification of physical and electrical characteristics
at a 2-wire analogue presented NTP
for short to medium length loop applications

admin 发表于 2015-1-2 17:47:42

谢谢您的分享，金币已奖励
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