TDM over IP(CES) : G4620, G1620
                   EtherMUX, EtherAIR

Inverse Mux(IMA) : YG480E, G1200S, G4100S, G8100S
E1 add-drop ADM : YG320AE, YG320ER, YG320AF
Fiber/E1 to V.35/E1/LAN Gateway : YG120F, YG120E

E1/T1 Tester : MR2000E