For example: Agilent E4440A or Anritsu 68369
Communications
Anritsu MP1763B/MP1764A
MP1763B/MP1764A Pulse Pattern Generator/ Error Detector System
Manufacturer: Anritsu
Anritsu MW8208A
PIM Master Passive Intermodulation Analyzer, Cellular Band (850 MHz)
Manufacturer: Anritsu
Keysight / Agilent N1645A
ATM Cell Processor & SONET/SDH Interface Test Module
Manufacturer: Keysight / Agilent
Keysight / Agilent N1725A
auroraDuet Basic Rate and Primary Rate ISDN Tester
Manufacturer: Keysight / Agilent