The Tellabs Type 1011 Mounting Shelf series. It is an 11 position shelf that mounts in a 19" rack. Wescom made a similar one. The slot connectors are standard 56 pin type wire wrap for NCTE equipment modules. These shelves came in various configurations.
What type of modules do you plan to use?
Is yours prewired?
Model 1011UC is one of the connectorized universal shelves and there should be a label on one side near the mtg bracket to indicate what you have. I may have the practice for those shelves. I will have to check my Tellabs library, which is all print copy and is contained in 5 or 6 large three ring binders.
Now the prewired shelves were not wired for DS1 modules, unless it was special order from Tellabs. So you may have to do the wiring or rewiring yourself. What DS1 modules are you planning to use in it?
....JIM....