Genuine Original Dees Communications 154 48VDC 0.17A 8 Trunk Station Powerfail Bypass Unit DEES154. PBX power-fail-transfer units (PFTU's) will re-direct an analog trunk to an analog phone (bypassing the PBX), allowing an analog phone to still make and receive trunk calls in the case of a PBX failure. DEES Model 154 (48VDC) provides bypass for up to 8 analog trunks during a PBX or power failure. Multiple units can be connected to handle more than 8 trunks. Units can be activated by power failure, a manual bypass switch, or a ground from a local or remote location. The Model 154 can also control auxiliary equipment via two sets of relay contacts (NO and NC). In the event of a power failure at the PBX the Bypass Interface automatically bypasses the PBX system and switches eight C.O. trunks to the preselected stations. When bypass is no longer required, a loop usage monitor circuit restores only the idle trunks. Active trunks remain in bypass mode until completion of the present call, and are then restored. Presence of power at the PBX is indicated by a red L.E.D. mounted on the front of the unit. A manual switch allows local control of the Bypass. The normal position allows control by the presence of power at the PBX, the bypass position puts all 8 channels into the bypass model. Two 25 pair industry standard Amphenol (male) connectors on the side of the unit provide all connections required for C.O. Trunks, PBX Trunks, Station Telephones and PBX Extensions.

Part Number: DEES154
Compatible Numbers: FCNCAN-22540-OT-N