I Agree with Bunnie, They are not needed, but very helpful on determining where the problem is... If its Customer, or Telco.. Also, its actually an extra Protection from telco line spikes (although the smart jack has a lot of lightning supression, and protection) but if something were to get thru, it would take out the ADTRAN before taking out the T1 card, or switch.


Contract SQL/C# Developer / Network Engineer