ISDN Interfaces
RPTU Installation
5-4 Strata CTX I&M 10/02
Slot Assignments
Up to eight RPTU PCBs can be installed in a Strata CTX system providing up to 188 PRI lines
(B-channels). If RPTU (PRI) and RDTU (T1) PCBs are installed, the maximum combined PCBs
cannot exceed the eight. The PCBs must be placed in designated slots in each of the cabinets.
Refer to Chapter 1 – Strata CTX Configuration, “ISDN PRI Digital Line PCBs” on page 1-39, for
the guidelines regarding RPTU PCB slot assignments.
RPTU Installation
Before installing a RPTU PCB into a Strata CTX system, refer to Chapter 1 – Strata CTX
Configuration:
• “Worksheet 6: Strata CTX670 Cabinet Slot Configuration” on page 1-36
• “ISDN PRI Digital Line PCBs” on page 1-39 (mentioned above in slot assignments)
➤ To install an RPTU PCB
1. Set the jumper wire plugs JP1 and JP2 (LB) to the Off position.
2. Turn the Strata CTX system power Off.
3. Insert the RPTU (component side facing right) into the appropriate slot (see “ISDN PRI Digital
Line PCBs” on page 1-39) and apply firm, even pressure to ensure proper seating of
connectors.
4. After installing the RPTU, gently pull the PCB outward. If the connectors are properly seated, a
slight resistance is felt.
Note For cabling information and requirements, refer to “Cabling” on page 5-7.
Table 5-1 RPTU Switches, Jumpers, and Connectors
Switches/Jumpers/Connector Description
SW1 (Line length adjustment switch)
Matches the RPTU impedance to the impedance of the
line (length between the CSU and the RPTU). Refer to
Table 5-3 on page 5-7.
SW2 (Reset switch)
1
1. If this switch on the Primary Clock source RPTU is pressed, the clock source will automatically revert to the
Secondary Clock source.
Resets or initializes the RPTU firmware. Press this switch
to correct an out-of-service condition, or just prior to
connecting to the Network PRI.
JP1 & JP2 (Loop-back jumpers)
Makes loop-back tests of the cabling between the ISDN
Network switch, CSU, and RPTU.
J1 8-pin Modular Connector (RJ45) Connects the RPTU to the CSU/network PRI ISDN line.
J2 6-pin Modular Connector (RJ11)
Connects the RPTU to a terminal or PC to monitor
D-channel data.
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