this is the topic of my project:
i havve a PBX-Private Branch Exchange- called LYRIC, it works at a system called Ground Start (GS), this system is related to give an idle lie to the PBX from the Central Office, BUt here in jordan the workable system called Loop Start (LS), so i have to make an enterface circuit which tarnsfere the LYRIC PBX system from the Ground Start (GS) to Loop Start (LS).
WHAT I NEED IS: a circuit diagram for a ground start to Loop Start Convertor (GS/LS converter).
Thanks,
Faris