CONVENTIONAL CHANNEL MODULE (CCM)SECTION 9 CONVENTIONAL CHANNEL MODULE (CCM)
9.1 DESCRIPTION

Refer to 3000 Series Switch Service Information manual, Part No. 001-3139-102, for the component layout, parts list and schematic. Refer to Figure 7-1for the Basic Board block diagram. The Conventional Channel Module (CCM) connects the Switch to a Conventional Repeater. Each repeater has a CCM that controls the repeater through logic signaling.

9.1.1 REPEATER SIGNALING

The CCM exchanges control information with the CRM via Audio Frequency Shift Keying (AFSK) data in a blank and burst mode on the voice audio path.

9.1.2 REPEATER CONTROL

The CCM monitors and controls the repeater transmit, receives confirmation of all requests made to the repeater and sends information the repeater received.

9.1.3 VOICE CONNECTION

The CCM provides a 4-Wire 600 ohm balanced voice connection to the repeater, converts audio to and from Pulse Code Modulation (PCM), transmits and receives on the PCM buses, and controls voice audio gating to and from the repeater.

9.1.4 INTERNAL COMMUNICATION

The CCM uses the Intra-Terminal Data Bus (IDB) to communicate to other modules and send messages to and receive messages from the Call Processor that controls its actions.

The status of the CCM/CRM/Repeater combination is determined by the other modules by what the CCM transmits on the Channel Status Bus (CSB). The other modules monitor the CSB and determine if a CCM has the appropriate group and status for the type of communication the module requires.

9.2 CCM SETUP PROCEDURE

9.2.1 CCM SWITCH SETTINGS

Refer to Figure 9-1for Alignment Points Diagram.

Command and Control Communication

The command and control communication to the Conventional Repeater Module (CRM) is by blank and burst mode of Audio Frequency Shift Keyed data on the Main audio lines.

9.2.2AFSK COMMUNICATION ON THE MAIN LINES

Refer to Table 9-1for switch settings.

Table 9-1 CCM SWITCH SETTINGS

 

Switch

 

Open Sections

 

Close Sections

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

 

1

-

 

-

 

4

-

2

3

-

 

S3

 

1

2

 

3

 

4

-

-

-

-

 

S4

 

1

2

 

3

 

4

-

-

-

-

 

S5

 

-

-

 

-

 

-

1

2

3

4

9.2.3 CCM JUMPER PLACEMENT

 

 

 

 

Table 9-2 CCM JUMPER PLACEMENT

 

 

 

 

 

 

 

 

 

 

 

 

 

JU

Pin

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

J24

1 to 2*

 

 

Selects 27512 EPROM operation

 

 

 

2 to 3

 

 

Selects 27256 EPROM operation

 

 

J27

1 to 2

 

 

Not used

 

 

 

 

 

 

 

2 to 3*

 

 

Normal operation

 

 

 

 

P33

1 to 2

 

 

open

 

 

 

 

 

 

 

 

 

3 to 4

 

 

open

 

 

 

 

 

 

 

 

 

5 and 6

 

open

 

 

 

 

 

 

 

 

J36

1 only

 

 

Not used

 

 

 

 

 

 

 

1 to 2

 

 

-48V E-lead operation

 

 

 

 

 

2 to 3

 

 

-15V E-lead operation

 

 

 

 

J14

Jumper pin 1 to 2 for high impedance ground path

 

J15

for split 600 ohm inputs and outputs. Leave open if

 

J21

no ground path desired.

 

 

 

 

 

 

J22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* Indicates normal operation.

 

 

 

 

 

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