E F Johnson Company 2425795 Benutzerhandbuch
8-4
Viking™ VP600 Portable Radio Operating Manual
Secure Communication (Encryption)
SLN Mode - The SLN mode must be selected when either OTAR (Over-The-Air-
Rekeying) or the EFJohnson Technologies System Management Assistant (PDA
keyloader) is used. It can also be used if OTAR is not used. SLN mode is digital
encryption, and can also be used with the Motorola KVL-3000 and KVL-3000 Plus, if
optioned for Astro 25. With this mode, keys are loaded into a SLN (Storage Location
Number), typically from 0 to 4095. The Keys Table must then be programmed to link
channel PIDs to a specific SLN.
Rekeying) or the EFJohnson Technologies System Management Assistant (PDA
keyloader) is used. It can also be used if OTAR is not used. SLN mode is digital
encryption, and can also be used with the Motorola KVL-3000 and KVL-3000 Plus, if
optioned for Astro 25. With this mode, keys are loaded into a SLN (Storage Location
Number), typically from 0 to 4095. The Keys Table must then be programmed to link
channel PIDs to a specific SLN.
The use of this type of indirect linking allows keysets and key IDs to be changed
through OTAR while keeping the mapping from the channel or talkgroup the same. For
example, as shown in Figure 8.1, PID 4 selects SLN 24 which selects key slot 24 in both
keysets. This slot contains Key ID 69 in Keyset 1 and Key ID 91 in Keyset 2. Only one
keyset is active at a time. The actual key, chosen between these two to transmit with,
will depend on which keyset is active, Keyset 1 or Keyset2.
through OTAR while keeping the mapping from the channel or talkgroup the same. For
example, as shown in Figure 8.1, PID 4 selects SLN 24 which selects key slot 24 in both
keysets. This slot contains Key ID 69 in Keyset 1 and Key ID 91 in Keyset 2. Only one
keyset is active at a time. The actual key, chosen between these two to transmit with,
will depend on which keyset is active, Keyset 1 or Keyset2.
8.2.3 Maintaining Keys in Memory
The radio may need to be connected to a constant power source to preserve the encryption
keys in memory. The radio may be programmed to determine if keys are permanently
stored in memory or erased soon after power is removed.
keys in memory. The radio may be programmed to determine if keys are permanently
stored in memory or erased soon after power is removed.
If programmed for infinite key retention, keys are stored in memory and are not lost when
power is removed. If it is disabled, they are maintained only until the storage capacitance
discharges. Estimated time for losing keys with infinite key retention unchecked is 3.5
minutes with 4.7 uF cap.
power is removed. If it is disabled, they are maintained only until the storage capacitance
discharges. Estimated time for losing keys with infinite key retention unchecked is 3.5
minutes with 4.7 uF cap.
8.2.4 Encryption Key Select
Note
This feature is available on P25 trunking and conventional channels.
When multiple encryption keys are programmed (see preceding information), the Key
Select option button can be programmed to allow selection of another key for the current
channel. This feature changes the PID (hardware location) of the key, and the change is
permanent (cycling power or selecting a different channel does not reselect the original
key). Therefore, to switch back to the original key, it must be manually reselected. Proceed
as follows to select a key:
Select option button can be programmed to allow selection of another key for the current
channel. This feature changes the PID (hardware location) of the key, and the change is
permanent (cycling power or selecting a different channel does not reselect the original
key). Therefore, to switch back to the original key, it must be manually reselected. Proceed
as follows to select a key:
1 Press the Key Select button or select that menu parameter.
2 Press the Up/Down buttons to display the desired key and then press the
(Menu)
button to select it. Press the
(Clear) button again to return the display to normal
operation.