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 Configuring the G4/5 For QCII over P25 Operation 

 

 

1.

 

Overview

 

QCII over P25 offers a number of advantages for implementing a paging solution on a P25 System.  
They are: 

 

Minimizes use of TGIDs 

 

Minimal Dispatching process change 

 

Pager behavior closely matches that of the Minitor/G1 Analog pagers 

 

Works over Motorola ABME++ Capable RF 

 

Uses the identical QCII Tone set as Motorola 

 

Works with Wireless and IP connected Console environments 

In the following sections a detailed review of QCII coding, Tone Sets and ways to configure the G4 or 
G5 to support various behaviors are provided. 

 

2.

 

How Does QCII over P25 Work?

 

QCII over P25 uses a Talk Group ID (TGID) and it is over this TGI

D’s assigned Talk Channel that the 

QCII, 2-Tone, ID is sent.   Many Dispatch Centers will patch analog VHF/UHF Channel traffic to a P25 
TGID so Portable and Mobile users can hear these transmissions.  In such applications adopting to 
QCII over P25 paging should be straightforward.  

There are differences between a standard analog 2-Tone frequency set and the set used for QCII 
over P25 paging.   

Refer to Figures 1 and 2 on the following pages.

   

Figure 1

 is an example of a Motorola analog 2-Tone set and one can see the tone frequencies are 

defined and their spacing runs 3-6%.   

In 

Figure 2

, QCII over P25 defines frequency range of 31.25 to 62.5Hz for each of its 72 groups. 

Any frequency that falls into a specific range is decoded the same.  So, for example, if an analog 
tone of 349Hz is patched to a P25 TGID, it will get decoded as Index 3.  And, an analog tone of 
330.5Hz will also get decoded as Index 3. 

The significance of these differences and how one programs a G4/5 for QCII over P25 will be 
explained in a later section. 

Summary of Contents for G4

Page 1: ...h Centers will patch analog VHF UHF Channel traffic to a P25 TGID so Portable and Mobile users can hear these transmissions In such applications adopting to QCII over P25 paging should be straightforw...

Page 2: ...Page 2 Figure 1...

Page 3: ...Page 3 Figure 2...

Page 4: ...Take into consideration if there is too much traffic on a currently used TGID it may delay the sending of a QCII page c What 2 Tone Coding Plan is going to be used The answer to the above question dep...

Page 5: ...to dispatch viii A suggestion is one use the standard Motorola 2 Tone Groups to create the above IDs keeping in mind the one to one relationship described in paragraph 3 c e Once the above steps are...

Page 6: ...and Channel Setting In Tab D 5 there are several new settings and a new Talk Group List Figures 5 9 represent one Selector Knob setting and each new setting and the Talk Group List will be explained i...

Page 7: ...Page 7 Figure 7 Figure 8...

Page 8: ...back to stand by mode awaiting a QCII page c Selective Manual Reset Same as the above except one must depress the pager s Reset Key Button to cause the pager to return to the stand by mode d Monitor...

Page 9: ...il it detects a programmed QCII ID and stores the paging voice message After the voice message the pager goes to stand by mode awaiting a new page However if a TGID is assigned to either Table that is...

Page 10: ...nd if detected will alert and store the message 3 Sub Group Monitor Manual Alternative Setting Disabled N A No traffic on the QCII associated TGID is heard unless QCII ID is detected If a non paging T...

Page 11: ...Reset must be selected d Delay N Function To ensure the received voice message is stored this must be enabled e Delay N Timer This setting works in tandem with the Delay N Function The value selected...

Page 12: ...Page 12 Figure 1A Figure 2A...

Page 13: ...Page 13 Figure 3A Figure 4A...

Page 14: ...continue to monitor all transmissions to the selected TGID Any non QCII transmissions on the selected TGID are not stored To configure the G4 5 for this behavior follow the same procedure for Selecti...

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