The TE420B has been discontinued by the manufacturer. The replacement product is the TE435B.
Digium's TE420 PCI Express card provides termination of up to 120
channels of voice or data across four E1, T1, or J1 interfaces in a
PCIe x1 form factor. Selectable on a per-port or per-card basis, the
TE420 allows E1 and T1 circuits to be mixed with full channel
synchronization. Supporting PCIe x1, the TE420 may be used in any
available PCIe 1.0 compliant slot - 1x, x4, x8, and x16 without
considerations for voltage selection or lane size.
The TE420 may be combined with Digium's VPMOCT128 Octasic DSP-based
echo cancellation module (not shown in picture). The VPMOCT128 provides
the G.168 algorithm which has been labeled a benchmark for echo
cancellation and performs 128ms (1024 taps) of echo cancellation across
all 128 channels in E1 mode or all 96 channels in T1/J1 modes. Bundled
with the VPMOCT128, the product SKU is TE420B.
Digium has designed the TE420 to be fully compatible and integrated
with Asterisk Business Edition, AsteriskNOW, and open source Asterisk.
The TE420 supports industry standard telephony protocols including
North American and European Primary Rate signalling as well as standard
Robbed Bit, Channel Associated Signalling in addition to standard PPP,
HDLC, and Frame Relay data modes.
4 Digital Interface Ports Support both Voice and Data
Selectable T1, E1 or J1 Mode
PCI- Express 1.0 compliant
Can be used in PCI-E x1, x4, x8, or x16 slot
Bundled with VPMOCT128 Hardware Echo Cancellation Module as
Digium TE420B with Echo Cancellation Module Specifications
Digium TE420B with Echo Cancellation Module Resources