The picture you selected was of an MDR-8000 Carrier Class microwave from one of the sites for our microwave backhaul. The card missing is actually an open slot to add a special card for SNMP tracking of the alarms on these devices. I have taken some time at learning how these operate and have repaired sites that had been down for 4 years or more. These wonderful pieces of equipment have a history in aiding AT&T at getting over the mountains in many states and I was notified that they are also in use throughout the State of Colorado. Nokia would like us to purchase the new 9500 and after I leave the State may have to resort to this since I am the only person currently with experience.