INTER-TEL 550.2300 LOOP START CARD 4 PORT T113064

826.4005-5, REV 5AA. The Inter-Tel 550.2300 is a loop start card for Axxess phone systems. The LSC provides 4 individual ports for loop start CO lines. This allows 4 analog line trunks (FXO) into your phone system from your telecom company. The 550.2301 loop start card 4 port daughter board is an optional card that brings the 4 port card for a total of 8 ports from a single module slot.