T1
Slot Assignments
Strata CTX I&M 10/02 6-3
T1
RDTU Installation
1. Set jumper wire plugs P1 (LB), P2, P3, and P4 to the Off position. See “Loop Back Testing” on
page 6-10 for loop back testing procedures.
See “SW1 Equalizer Switch and Loop Back Jumpers (Internal Option)” on page 6-2 for the
appropriate SW1 equalizer switch setting.
2. Insert the RDTU (component side facing right) into the appropriate slot and apply firm, even
pressure to ensure proper mating of connectors. (See “Worksheet 6: Strata CTX670 Cabinet
Slot Configuration” on page 1-36 for RDTU slot assignment recommendations.) (See Figure
6-1).
5439
PDKU
Primary Reference PCB*
Secondary Reference PCB*
Other RDTU, RPTU, or RBSU
CTX Digital Transmission Voice Path
Synchronization
Circuit
Synchronization
Circuit
Synchronization
Circuit
Digital Voice
Path
Digital Voice
Path
Digital Voice
Path
CTX
Digital
Telephone
Standard
Telephone
SS
1
SS
2
SS
3
Line 1
Line 2
Line 3
Public Switched
Telephone
Network (PSTN)
PRI, BRI, or T1
AT&T or
other provider
PRI, BRI, or T1
Other
PRI, BRI, or T1
provider
Stratum-1
Clock
Source
Processor PCB
Clock not synchronized properly
with Stratum-1 Clock Source
Time
Switch
Clock
Synchronization
Circuit
Clock synchronized properly
with Stratum-1 Clock Source
Other
Clock
Source
RSTU
Figure 6-1 RDTU Primary/Secondary Reference Block Diagram
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