Techroutes access product optical modem is to modulate fractional (N*64Kbps) to single or multi‐mode fiber.E1 time‐out, wavelength of ordinary fibre, and type of interface is configurable. Suit for transmit additional management data channel in different fibres. The fibre for transmit data can be used to monitor and control local and remote devices, and no collision will occur. It can also be used pair with V.35 fibre modem.