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9-9
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 7-1
for 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 combina-
tion 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 9-1 for 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.
9.2.2 AFSK COMMUNICATION ON THE MAIN
LINES
Refer to Table 9-1 for switch settings.
9.2.3 CCM JUMPER PLACEMENT
Table 9-1 CCM SWITCH SETTINGS
Switch Open Sections Close Sections
S1
S3
S4
S5
1
1
1
-
-
2
2
-
-
3
3
-
4
4
4
-
-
-
-
1
2
-
-
2
3
-
-
3
-
-
-
4
Table 9-2 CCM JUMPER PLACEMENT
JU Pin Description
J24 1 to 2*
2 to 3
Selects 27512 EPROM operation
Selects 27256 EPROM operation
J27 1 to 2
2 to 3*
Not used
Normal operation
P33 1 to 2
3 to 4
5 and 6
open
open
open
J36 1 only
1 to 2
2 to 3
Not used
-48V E-lead operation
-15V E-lead operation
J14
J15
J21
J22
Jumper pin 1 to 2 for high impedance ground path
for split 600 ohm inputs and outputs. Leave open if
no ground path desired.
* Indicates normal operation.