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23-1
BACKPLANE
SECTION 23 BACKPLANE
23.1 DESCRIPTION
The 3000 Series Switch shelf backplane contains
slots that modules are inserted into, to derive the
module address. The backplane distributes:
• Power
• PCM paths
• Master clock
• Master sync
• Intra-Terminal data bus
• Channel status bus
• Control lines for data busses
The backplane has active circuitry that distributes
PCM paths, master clock and master sync. The back-
planes are connected together for complete distribu-
tion of receive and transmit signals to all shelves
within the Switch.
23.2 BACKPLANE SETUP PROCEDURE
23.2.1 SHELF ADDRESS SETTINGS
Using the following table, determine the settings
of Switch 1 for the Shelf Address of each shelf.
23.2.2 TERMINATION SETTINGS
Using the following table, determine the switch
settings for switches 2 through 8. All switches are
37.5 ohms and normally set for 6 shelves.
• S2 - VTM PCM
• S3 - Primary Tx PCM
• S4 - Primary Rx PCM
• S5 - Master Sync
• S6 - Master Clock
• S7 - Secondary Rx PCM
• S8 - Secondary Tx PCM
23.2.3 JUMPER DEFINITIONS AND SETTINGS
1. External Cable Connections
• J1/J2 - Shelf Interconnect
2. Primary Audio Connections
• J3/J5 - Primary Rx PCM
• J2/J4 - Primary Tx PCM
3. Secondary Audio Connections
• J23/J25 - Secondary Rx PCM
• J24/J26 - Secondary Tx PCM
Table 23-1 SHELF ADDRESS SETTINGS
Shelf Number Switch 1, Open Sections
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
ALL Closed
1
2
1,2
3
1,3
2,3
1,2,3
4
1,4
2,4
1,2,4
3,4
1,3,4
2,3,4
1,2,3,4
5
1,5
Table 23-2 TERMINATION SETTINGS
Number of Shelves
Switch Sections
CLOSED
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
ALL
1,3,6,7,8
1
2,4,5,6,7,8
2,5,6,7,8
2,7
3,4,5,6,8
3,4,6,7
3,4,8
3,5,6
3,5
3,6,8
3,7
3
4,5,6,7,8
4,5,6,7
4,5,6