Synway Information Engineering Co., Ltd
Note: TEJXXXP(SSW) in Figure 1-1and Figure 1-2 represent available special-for-switch TEJ boards
Figure 1-2 Application Model II: VoIP Telephony System
1.1 Features
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DMA Read and Write
Uses the DMA technology to read and write data, greatly reducing the CPU cost.
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E1/T1/J1 Support
Provides an easy selection of the E1, T1 or J1 trunk and its matching impedance via
software reconfiguration, not requiring any change in hardware.
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Compatible with Asterisk
Entirely compatible with Asterisk in hardware, with all source codes open.
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Echo Cancellation
The echo cancellers developed by Synway for these boards use on-board DSPs to
work. TEJ101P(SSW), TEJ201P(SSW), TEJ401P(SSW), TEJ801P(SSW) support
up to 128ms for time delay estimation per channel, and TEJ100P(SSW),
TEJ200P(SSW), TEJ400P(SSW), TEJ800P(SSW) support 32ms. It not only cancels
out the effect of voice playback on DTMF and busy tones detection, but also avoids
self-excited oscillation and howling, and minimizes the possibility of registering wrong
DTMF and busy tones in a conference call, designed especially for VoIP application
environments.
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Voice CODEC Support
Supports A-law(G.711),
μ
-law codecs.
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Clock Sync Support
Supports input and output of CT clock, allowing clock synchronization with multiple
boards.
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A Particular Separation Design
CLEC
PBX
TEJXXXP(SSW)
T1
IP Phones
LAN
Switch
Special-for-Switch TEJ Digital Trunk Interface Boards Hardware Manual
(Ver 1.0) Page 2
