7M11 is a plugin which contains two independent 50 Ohms analog delay lines with 75nS each. Risetime is specified as max. 175pS and attenuation is fixed at two. A separate trigger output is available to eliminate an external power splitter and it is attenuated by a factor of five. Unfortunately there are four GR-874 50-ohm connectors and BNC-adapters are hard to find in the mean time.
Max. signal allowed is +-5V. Mass is about 2.5kg, so be carefully when plump it into the slot. Generally Tektronix specifies, not to ship mainframes with insertet plugins, to protect the bus connectors!
Because its completely passive and has no bus connector, it can be operated outside of the mainframe on the desk, giving free an additional slot for another plugin.