* Requires 5 dB 1550nm fixed loss attenuator for < 20km. Attenuator is available as a spare.** Minimum cabling distance for ER modules is 2m, according to the IEEE 802.3ae.*** Links longer than 30k
* Requires 15dB attenuator (ID# 64608) if Link Distance < 5km.Requires 10dB attenuator (ID# 48526) if Link Distance is between 5km and 25km.Requires 5dB attenuator (ID# 48523) if Link Distance is
* A 10 dB optical attenuator should be inserted between the fiber-optic cable plant and the receiving port on the SFP at each end of the link whenever the fiber-optic cable span loss is less than 8