Motorola APX 6000 Service Manual

3-58 Theory of Operation: Controller
As shown in Figure 3-41 above, the encryption design consists of 5 blocks:
• MACE IC
• Key Loading
• Key Retention
•Tamper
• Key Zeroize.
3.2.8.1 MACE IC
The encryption module uses the MACE IC and an encryption key variable to perform its encode/
decode function. The encryption key variable is loaded into the MACE IC, via the GCAI (side)
connector, from a hand-held, key variable loader (KVL). The MACE IC contains the particular
encryption algorithm purchased. Table 3-12 lists the encryption algorithms and their corresponding
kit numbers.
Once the MACE IC has its encryption keys and algorithm, it communicates with the radio' s host
processor (OMAP) through the Synchronous Serial Interface (SSI) bus. Both commands and audio
(clear and encrypted) are sent through the SSI bus. A communications failure between the host
processor and the secure module will be indicated as an ERROR 09/10 message on the display.
Table below lists the encryption algorithms and their corresponding kit numbers.
The MACE IC relies on a 4 MHz clock source provided by the CPLD, the clock is connected to
MACE's XIN pin (U2510-P5).
3.2.8.2 Key Loading / Fail
Key variables are loaded into the MACE IC through the keyfail line. The signal originates from the
GCAI connector (pin 8 of J2004) and is passed through the expansion board to the VOCON board.
The signal is then selected by a multiplexer (U4003) controlled by CPLD output, KEYFAIL_CTRL,
and the signal is routed back to the expansion board to the MACE's KYLD pin (U2510-B10).
Table 3-12. Encryption Algorithms and Corresponding Kit Numbers
KIT Number Description
NNTN8171_
APX 5000/APX 6000/APX 6000XE/SRX 2200 DVP-XL KIT
NNTN8172_
APX 5000/APX 6000/APX 6000XE/SRX 2200 DVP-XL KIT with Bluetooth
NNTN8173_
APX 5000/APX 6000/APX 6000XE/SRX 2200 AES KIT
NNTN8174_
APX 5000/APX 6000/APX 6000XE/SRX 2200 AES KIT with Bluetooth
NNTN8175_
APX 5000/APX 6000/APX 6000XE/SRX 2200 DES/DES-XL/DES-OFB KIT
NNTN8176_
APX 5000/APX 6000/APX 6000XE/SRX 2200 DES/DES-XL/DES-OFB KIT with Bluetooth
NNTN8177_
APX 5000/APX 6000/APX 6000XE/SRX 2200 NO ALGO BASIC VERSION
NNTN8178_
APX 5000/APX 6000/APX 6000XE/SRX 2200 NO ALGO BASIC VERSION with Bluetooth

Motorola APX 6000 Specifications

General

Brand	Motorola
Model	APX 6000
Category	Two-Way Radio
Language	English