Toshiba CTX28 manual Rptu Interface Unit, Rptu Installation, To install an Rptu PCB

ISDN Interfaces

RPTU Interface Unit

RPTU Interface Unit

Circuits per PCB: 24 channels

Interfaces with: ISDN PRI

Older Version(s): none

The RPTU provides 24 channels for ISDN PRI service. Network connection using RPTU PRI interface requires installation of a customer-provided CSU in most locations of the U.S. Refer to “CSU Requirements” on page 7-3for CSU installation.

Switches, jumpers, and interface connectors are described in Table 7-5. The RPTU’s LEDs show operation status (see Figures 7-4and 7-5 on page 7-9and Table 7-6).

Testing procedures (local and remote loop back) are in “Loop-back Test” on page 7-34.

RPTU Installation

Before installing a RPTU PCB into a Strata CTX system, refer to Chapter 2 – Strata CTX Configuration:

•“Worksheet 6: Strata CTX670 Cabinet Slots” on page 2-37

•“ISDN PRI Digital Line PCBs” on page 2-40(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 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 “BPTU and RPTU Cabling” on page 7-11.

Table 7-5	RPTU Switches, Jumpers, and Connectors
Switches/Jumpers/Connector		Description
		Matches the RPTU impedance to the impedance of the
SW1 (Line length adjustment switch)		line (length between the CSU and the RPTU). Refer to
		Table 7-7 on page 7-10.
SW2 (Reset switch)1		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.

1.If this switch on the Primary Clock source RPTU is pressed, the clock source will automatically revert to the Secondary Clock source.

7-8 Strata CTX I&M 06/04