International journal of communication systems. 1995;8(3):219-224. doi: 10.1002/dac.4500080307 Q31.82025
ISDN loop extension using a mid span amplifier
DOI: 10.1002/dac.4500080307
摘要
International journal of communication systems. 1995;8(3):219-224. doi: 10.1002/dac.4500080307 Q31.82025
DOI: 10.1002/dac.4500080307
摘要