TB9400/TN9275 Installation and Operation Description 17
© Tait International Limited May 2023
With P25/AS-IP operation, channel groups can comprise a mixture of
base station types. TB9400 and TB7300 base stations are fully compat-
ible and have identical timing in simulcast operation.
The TN9275 analog gateway supports all the channel group master
functions of P25/AS-IP simulcast and multicast networks that do not
directly involve the RF transceiver. This includes: the voter, the analog line
interface, DFSI interfaces, the console gateway interface, simulcast
transmit control and timing.
For more information on these applications, refer to the Help and
appropriate Tait System Manual. See “Associated Documentation”.
1.3.2 P25 Gateway Key Management
The base station and TN9275 P25 analog gateway support the gateway
function which allows an analog console to be part of a P25 talkgroup. The
gateway performs P25 vocoding and encryption as part of the conversion
between the balanced analog line console connection and the P25 air
interface. The functions supported are:
■ A call profile on the WebUI defines the conversion details. The gateway
has one single call profile in this release.
■ The technician defines the call type (analog or P25), the talkgroup
address, network access code (NAC), clear or encrypted operation as
part of the profile
■ The gateway supports a single P25 talkgroup, with or without
encryption
■ The gateway does not support individual calling, although the gateway
can send uplink individual call audio to the console (if it is clear audio
or if it has the decryption key)
■ The gateway supports both AES-256 and single-DES encryption
■ Encryption and decryption are performed in the hardware. You need
reciter hardware version 6.01 to use encryption.
■ The Tait Key Fill Device (KFD) can create and export keystore files.
The technician can upload a keystore file containing the encryption key
for encrypted operation. The KFD users guide (MNE-00010-xx) has
more detail.
■ The gateway can store an active key and an inactive key to allow for key
change-over
For a complete introduction to key management refer to the KMF Key
Management Manual (MBA-00048-xx).
The base station WebUI help also provides more detailed information.
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