18 Description TB9100/P25 CG/P25 TAG Installation and Operation Manual© Tait Limited March 201412V DC PA-Only Base Station/RepeaterThe base station can be provided without a PMU for those who prefer touse an external third party power supply. The 12V DC input is connecteddirectly to the 12V PA. This is a variant of the PA that includes a boostregulator board. This board converts the 12V nominal DC input to a28VDC output to power the PA circuit boards. The boost regulator boardalso provides a 12VDC output to power the reciter. Customers must providetheir own power supply. Without a PMU, the base station can only bepowered by DC and cannot carry out its power management functions.Receive-only Base StationThe base station can be provided as a receive-only variant in systems thatneed sites to enhance the receive coverage. This consists of a single reciterin a subrack, with or without power management. The exciter is present butnot licensed to transmit.Console GatewayA console gateway consists of a gateway module in a subrack, optionallywith a PMU. A subrack can contain several gateway modules. The consolegateway’s analog line connects to the dispatch system, and its Ethernetinterface connects to the Tait P25 Network. It has no RF functionality.Encrypted voice quality is indistinguishable from unencrypted.The console gateway supports Project 25 compliant DES (via the basicencryption license) and AES (Advanced Encryption Standard) with the AESlicense.Since the control panel is another analog access point, decryption at thecontrol panel could be a point of insecurity in the system. For this reason,there is no encryption or decryption to the control panel. The control panelspeaker plays unencrypted speech (if that is present at the gateway). If thegateway is receiving or transmitting encrypted speech, the speaker simplyproduces encrypted noise.Trunked Analog GatewayA trunked analog gateway consists of a gateway module in a subrack,optionally with a PMU. A subrack can contain several gateway modules. Atrunked analog gateway differs from a console gateway only in the softwarefeature licenses it has. The trunked analog gateway’s analog line connects tothe dispatch system, and its Ethernet interface connects (via the CSSIprotocol) to an RFSS controller in a Tait P25 Trunked Network. It has noRF functionality.