The D1M-1E1013 is a 56-circuit, DS1/DS3 combination interconnect panel. DS1/DS3 combination interconnect panels contain pairs of jacks that are internally connected together. The permanent internal connection between jacks dedicates two network elements to each other. The front jacks provide test and monitor access for the DS1 and DS3 signals respectively. Some key features and benefits of the D1M-1E1013 are: Die-cast Bantam jacks are rigorously tested with over 10,000 insertions/withdrawals, Permanent internal connection between jacks, Combination panel handles both DS1 and DS3 circuits, Guarantees reliability, durability, and quality over time, Dedicates two network elements to each other at customer premises locations, Used for customer premises, cabinet, or CEV applications.