Supporting Hardware Echo Cancellation Asterisk Card with 1-4 E1/T1/J1 Digital Port Ready for Asterisk, Trixbox, Elastix, etc. Fully support Zaptelcompatible hardware Easy to use Global usable
The VC420Dprovides a wealth of line encoding (AMI / BSZS / HDB3), hardwareframe processing(CRC4 / non-CRC4 / ESF / D4T1 / E1). Every card provides two independent HDLC transceiver and support SS7 FISU transmit-receive. The card also provides two independent Jitter Attenuator. The VC420Dreserved slot for echo cancellation. Carrier-grade EC modules have been provided. The EC module also can provide optimizing of voice quality. The card provides 32bits transmission in both DMA slave and master mode. The data in every DMA transmission can be adjusted according to different motherboard to reach the maximum. This series cards including 3 models. VC420D-1/VC420D-2/VCL120D-4, corresponding to 4 \2 \1 E1 / T1 / J1 interfaces. VC420D is 9.5 CM long, 10 CM high and compliance with PCI 2.2 standard interface card. ECmodule can be inserted to the slot on the card to provide hardware echo cancellation.