The enhanced digital voice port adapter family consists of two members: the Two-Port T1, E1 High-Capacity Enhanced Digital Voice Port Adapter, and the Two-Port T1, E1 Moderate-Capacity Enhanced Digital Voice Port Adapter. Both port adapters offer the same industry-leading feature set and performance. The cards differ only in their overall voice-channel capacity.The enhanced digital voice port adapters are highly integrated solutions offering a leap forward in voice-channel density and application flexibility. These single-width port adapters incorporate two universal ports that can be configured for either T1 or E1 connection with high-performance digital signal processors (DSP) that support up to 48 or 120 channels of compressed voice. Integrated channel service units/digital service units (CSU/DSU) echo cancellation, and Digital Signal Level 0 (DS0) drop and insert functionality eliminate the need for external line-termination devices and multiplexers, which simplifies network design and management.