The HP / Agilent 81618A is a single interface modules, used to connect optical heads ( Agilent 8162x ) to the mainframes 8163A/B, 8164A/B or 8166A/B. The following optical heads are used with these interfaces: 81623BGe, +10dBm to -80dBm 81624B 5mm InGaAs, +10dBm to -90dBm 81626B InGaAs, +27 dBm to - 70 dBm 81628B InGaAs, +40 dBm to - 60 dBm Features Fully compatible with all 8152x and 8162x Optical Heads Fits in all 8163/8164/8166-series Flexibility through 1- and 2- channel option