Column tail optical fiber repeater

1. It uses the standard GSM-R transmission protocol; 2. It provides Ethernet transmission interface and has the function of preventing network storm.            3, It provides the GPRS modem transmission interface. 4, the equipment should have concatenated flag bit which can be query and set. 5, considering the convenience of engineering maintenance,the debugging software can not only query and set up local devices, but also query and set up remote devices, and query the status of the working indicator of remote device . 6, because threshold switches and power amplifiers have threshold functions, they only preserve the threshold function of the power amplifier, transform the threshold switch, remove the threshold function, and provide the function of input signal indication, attenuation and input detection .

1 work method: to detect state and direction of the entrance and exit of the train with probe in  two holes. 2 communication way: different frequency duplex 3 communication frequency: 468.2MHz, 458.2MHz; 4 work bandwidth: 467MHz ~ 469MHz, 457MHz ~ 459MHz

 5 The maximum output power:37(±2)dBm ; the output power detection range: 0 ~ PomaxdBm, the measurement accuracy:±2dB;

6 automatic level control (ALC) 

 Under the condition that the repeater operates at the maximum gain and the maximum output power, when the input signal level is increased by no more than 10dB, the output power should be kept within ±2dB of the maximum output power. When the input signal level is increased by more than 10dB, the output power should be kept within ±2dB of the maximum output power or close the output.            

 The ALC control range: 20 ~ 37dBm, the control accuracy ±2dB.            

 7 The maximum gain of system: (optical attenuation is 0):95±2dB;            

 The maximum nominal gain error is not more than ±2dB.            

8 gain adjustment range: ≥30dB. 

 9 gain adjustment step and gain adjustment error: gain adjustment step ≤1dB;            

 Gain adjustment error ≤±1.5 dB.            

 10 Passband Ripple≤2dB (peak value).            

 11 noise coefficient ≤5dB.            

 12 input voltage and the output voltage SWR ≤1.4          

13 the maximum allowable input level: when input level is 0dBm, 1 minute repeater has no damage.             14 Stray emission:            

9kHz-1GHz in-band：≤-36 dBm/100kHz；

1GHz-12.75GHz in-band：≤-30 dBm/1MHz.

15 third order intermodulation:  Working frequency in- band          

 The downlink intermodulation ＜-36dBc（@ Po = 37dBm，△f=50KHz）

 The uplink intermodulation ＜-36dBc（@ Po = -10dBm，△f=50KHz）