OpenVox ACC0001 Timing Cable for T1 E1 and Analog CardsThe ACC0001 pair is intended for systems that has 2 or more cards installed. This is a standard two pin jumper cable. This cable will allow Analog and T1 E1 Card to share the same sync (timing) source from the T1 E1 line provider. This will ensure a consistent sync source across multiple installed cards in the same system. Compatible Hardware: A810E P A1610E P A2410E P D230E P D410E P D430E P