Each modem on the V.34 12-port module supports V.42bis data compression and uses the Hayes Smartmodem AT and V.25bis command sets. The Microcom Networking Protocol (MNP) and V.42 error-correction protocol standards provide error-free performance. The modem offers MNP Class 10 with Adverse Channel Enhancements (ACE). MNP 10 includes multiple connection attempts during autoreliable link negotiation, negotiated speed upshifts, aggressive adaptive packet assembly, Dynamic Transmit Level Adjustment.