Nortel compatible NTK588AGE5-ACC is XFP (10 Gigabit Small Form Factor Pluggable Module) Transceiver, operating over Double Fiber DWDM Single-Mode Fiber (SMF) optical cable. It has minimum guaranteed optical budget of 23 dB, with in most cases is enough to reach about 80 km distance. However, distance is just indicative parameter calculated for comfort of identification. Eventually we calculate distance taking in account minimal optical budget and average attenuation of optical cabling in industry. This transceiver use top quality EML Laser transmitter with operating at nominal wavelength Ch. 58 (1531.12 nm) and ITU-T DWDM Grid 100 GHz C-Band APD Photodiode receiver. It support DDM/DOM optical diagnostics, with provide diagnostic information about the present operating conditions. Nortel compatible NTK588AGE5 operates in Standard 0ÃÂð-70ÃÂðC temperature range and has Double LC interface