E1
In digital telecommunications, where a single physical wire can be used to carry many simultaneous voice conversations, worldwide standards have been created and deployed. E1 circuits are common in most telephone exchanges and are used to connect medium and large companies to remote exchanges and in many cases between exchanges. Unlike Internet data services, E-carrier systems permanently allocate capacity for a voice call for its entire duration. This ensures high call quality because the transmission arrives with the same short delay (Latency) and capacity at all times. The standard also specifies the presentation at the customer end (G703). An E1 connection is of 2Mb capacity.