TE420E数字中继语音卡是4个E1/T1接口的电话语音卡，最大支持120路并发语音电话呼叫，支持SS7中国7号信令，30B+D ISDN-PRI信令，R2随路信令一号信令等局间信令，支持网络侧和用户侧，标准DAHDI驱动，适用于Linux操作系统下的Asterisk软件，支持麒麟、统信等国产信创操作系统。
TE420E主要功能参数Key Features
Digital PCI-Express， PCI-Ex1 interface， support PCI-Ex4，PCI-Ex8，PCI-Ex16
1-4 Ports E1/T1/PRI ，120 concurrent
RJ48C Ports，with RJ48C to BNC cable
DAHDI driver, Zaptel driver
Temperature: 0 to 50° C
Framing Types
Superframe (D4)
Extended Superframe (ESF)
Channel Associated Signaling (CAS)
Common Channel Signaling (CCS)
Coding Types
Alternative Mark Inversion (AMI)
Bipolar with Eight (8) Zeros Substitution (B8ZS)
High Density Bipolar of Order Three (3) Code (HDB3)*
*Optional Cyclic Redundancy Check 4 (CRC4)
Primary Rate Interface (PRI) Switch Types
National ISDN 1 (NI1) National ISDN 2 (NI2) Nortel DMS100 AT&T 4ESS
Lucent 5ESS EuroISDN Q.931
Q.SIG (Limited Support)
*Both PRI NET and PRI CPE are Supported
Signaling Types
E&M, E&M E1, E&M Wink Feature Group D (DTMF) Feature Group D (MF)
Feature Group D (Tandem Access) Feature Group B
Feature Group C-CAMA Feature Group C-CAMA (MF)
Foreign Exchange Station (FXS) Loop Start, Ground Start, Kewl Start
Foreign Exchange Office (FXO) Loop Start, Ground Start, Kewl Start
PRI Network and CPE
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