V-EPE-2 2*E1 channel protection switching device is “1+1” protective device, it transmits E1 signals it receives from user’s device to two transmission routers and selects the E1 signals of good quality automatically, then transmits them to user device.
The system can adjust the transmission delay skew of two transmission routing signal, the maximum delay skew is 32ms, when the switch level is set as 0, the switch time is bits level. Therefore，it can remove the damage of user signal caused by the signal transmission routing error, ensuring the user device works normally.
This system is available for all the important 2Mb/s circuit that needs special protection. For example, telecommunication, mobile, electricity, bank, securities, party and government administration, customs, public securities, maritime affairs, and so on.
 

*It transmits E1 signals it receives from user’s device to two transmission routers, this is the concept of “double sending”. It will select the E1 signals of good quality automatically and transmits them to the customer device.
* (PCM 30 framing mode) is available to the suggested framing PCM circuit of ITU-T G.703, G704 and G.823.
*(Non-PCM framing mode) is available for the non-framing fracture’s E1 circuit such as multi-links protocol format IP circuit, CISCOHDLC format’s point to point dedicated circuit, LAPF format’s frame relay circuit, LAPB format’s X.25 exchanged circuit in groups.
* It has two main functions: monitoring of transmission channel performance and controlling of non-damage switching.

Interface:Confirms to the suggestion of ITU-T G.703,
                 G704 and G823
Bits Rate:2048kbit/s±50ppm
Circuit Code Pattern:HDB3
Impedance:75Ω or 120Ω
CRC-4 Plug In Time Delay:<250us
System Time Delay:≤600us(PCM framing)  
                                    ≤10ms(non PCM framing)
The delay skew of the two lines:≤32ms
Switching Delay Skew:0(when the switch level is 0)
Time Mark Insertion:Inert te time mark with Sa bits
Working temperature:0℃～40℃
Relative Humidity:≤85%(25℃)
Switch the Judgment Parameter: Alarms－LOS, AIS, LOF, MLOF, SLOF.
error mode－10E-4,10E-6,bit(PCM framing),loss rate(non-PCM framing).