... transmission 5) For HDSL 6) For telephone interconnectContact Detail: CHENGYI ELECTRONICS CO.,LTD Http://czchengyi.en.alibaba.com Mobile No.:0086-13715732050 Tel ... series: ERL-28, 35, 39, 42, 49 ETD series: ETD-29, 34, 39, 44, 49, 54, 59 EFD-15, 20, 25, 30The ...