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1U Modular E1 failover (protection) unit

1. Summary Our ZMUX-122 is a "1+1" E1 channel protection device,which is used to distribute the incoming E1 streams to 2 transmission routes through main and stand-by E1 interfaces, simultaneously, supervision informaion of transmission quality is inserted, and the signal from "BETTER" transmission routes will be transmitted to subscriber's equipments after the signal quality of two transmissions is analyzed. This device can calibrate the delay of two transmissions, the acceptable max delay is 32ms for main and stand-by E1 transmissions. When the switching level is 0, the switching time is ns (bit level),thus,damage(that is caused by routing transmission failure) on subscriber's signal can be eliminated to ensure that subscriber's devices work reliably. Our ZMUX-122 can automatically or manually switch 2 E1 channels between 2 main and 2 stand-by E1 channels without damage on transmitted data so as to protect 2 important E1 incoming streams from subscriber's device.   2. Function Description Concurrently,our ZMUX-122 can transmit incoming E1 streams from subscriber's device to 2 routing transmissions,automatically choose and send the BETTER E1 signal to subscriber's device after receiving the incoming E1 streams from 2 transmissions. In PCM30 framing format,our ZMUX-122 is suitable for PCM framing channel that complies with ITU-T G.703, G.704, G.823 recommendations. In PCM unframing format, our ZMUX-122 is suitable for PCM unframing E1 channels,such as IP circuit of multi-link  layer protocols,point to point dedicated circuits of CISCO HDLC protocol,frame relay circuit of LAPF protocol, X.25 circuit of LAPB protocol. The two main functions of our ZMUX-122 is supervision on performance of transmission channels and safe switching control. This device can supervise real-time signal quality (informations of error and alarms)of two routing transmissions  and choose one E1 incoming stream based on switching mode to make switching without damage. The max delay of two E1 links is up to 32ms, the subscriber's device is connected to main E1 channel directly when power failure occurs. This device can work in automatic switching mode, it can be switched manually to work on main or stand-by E1 channel when in manual switching mode.In automatic switching mode, this device can be set to varied switching levels based on actual requirements. The E1 switching will happen when the set level is met or surpassed. "Mandatory switching" is the highest level, and the switching levels are ranked from highest to the lowest in the following: The default PCM format: PCM30 framing format The default switching level: level 0   LOS AIS LOF MLOF SLOF 10E-4 error mode 10E-6 error mode single bit error mode level 7 level 6 level 5 level 4 level 3 level 2 level 1 Level 0 Notes: 1) The default setting of working mode is: PCM framing format. 2) The default setting of switching level is: level 0.   3. Technical Parameters a) Interface:   conforms to the ITU-T G.703, G704 and G823 recommendations b) Bit Rate:    2048kbit/s±50ppm c) Line Code Type: HDB3 d) Line Impedance:              75Ω or 120Ω e) CRC-4 Insertion Time Delay:

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