Toshiba Strata Dk14, Dk40i, Dk424 Installation And Maintenance Manual

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RPTU Interface Unit
Strata DK I&M 5/9914-5
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Table 14-3   DK424 Base Cabinet with RCTUE3/F4 with MBJU Removed
RPTU Installation
Before installing a RPTU PCB into a DK424, a number of system programs should be run. This 
enables the RPTU to function immediately upon insertion. It is recommended that you run these 
programs in the order listed in the DK Programming Manual (refer to the ISDN section) before 
beginning installation.
ä
To install an RPTU PCB
1. Set the jumper...

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RPTU Interface Unit
14-6Strata DK I&M 5/99
Figure 14-2 RPTU PCB
Table 14-4 RPTU Switches, Jumpers, and Connectors 
Switches/Jumpers/ConnectorDescription
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 14-6 on Page 14-8.
SW2 (Reset switch)
1
1. If this switch on the Primary Clock source RPTU is pressed (Program *42-1), the clock source will automatically 
revert to the Secondary Clock source...

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RPTU Interface Unit
Strata DK I&M 5/9914-7
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Figure 14-3 RPTU LEDs and Connectors
Table 14-5 LED Functions
LEDFunctions
FSYCFrame Synchronization
ON: Frame alignment is lost.
OFF: Frame alignment is working properly.
AISAlarm Indication Signal
ON: Receiving an alarm from the CO.
OFF: Circuit is working properly.
RABRemote Alarm
ON: Receiving a remote alarm from the CO.
OFF: Circuit is working properly.
LOSLoss of Signal
ON: IC signal cannot be detected.
OFF: Circuit is...

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RPTU Interface Unit
14-8Strata DK I&M 5/99
Cabling
To meet Part 15 of FCC Rules, ISDN PRI equipment must be connected using CAT5, Shielded 
Twisted-Pair (STP) cabling between the CSU and the RPTU. CAT5 STP protects against cross 
talk, Radio Frequency Interference (RFI), and/or Electro Magnetic Interference (EMI). STP 
protects ISDN signal data while being transmitted through the cable and keeps the cable itself from 
emitting EMI and RFI.
Important!To avoid ground loops, connect only the...

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RPTU Interface Unit
Strata DK I&M 5/9914-9
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Cable Installation
The RPTU PCB is shipped with a Toshiba RPRI cable kit for connection of the RPTU to a CSU. 
Install the kit as shown in Figure 14-3.
 
 
Figure 14-4 Detailed Pinouts for ISDN PRI Cabling
Network Jack/RPTU Modular Jack
PinFunction
1Tip – Receives from the network (NT – TE)
2 Ring – Receives from the network (NT – TE)
3 Not Used
4 Ring – Transmits to the network (TE – NT)
5 Tip – Transmits to the network (TE –...

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RPTU Interface Unit
14-10Strata DK I&M 5/99
Ferrite Core
Install the Ferrite core provided with the RPRI cable kit as shown in Figure 14-5. This core is 
needed to comply with FCC requirements.
Figure 14-5 Ferrite Core Installation
RPTU Testing and Troubleshooting
Loop-back Testing
The RPTU has loop-back test jumpers that enable physical connections (cables/jacks/plugs) 
between the RPTU, CSU, and the network PRI line to be tested (see Figure 14-6). The tests check 
that the CSU receives...

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Timing and Synchronization
Strata DK I&M 5/9914-11
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3. Turn the DK power ON and connect the PRI modular cord to RPTU RJ-45. 
4. After the PRI line and RPTU are synchronized, have the CO generate the loop-back test sign 
(all “1s” or “0s”). 
CAUTION!Do not have the CO do a QRS loop-back test, because the test signal may cause 
the DK to drop all calls and/or stop operating.
5. If the loop-back test fails, perform tests to isolate the problem with an ISDN test set, such as...

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Timing and Synchronization
14-12Strata DK I&M 5/99
The RCTU time switch is synchronized as the slave to the PRI, BRI, or T1 line (Line 1 in Figure 
14-7). The DK424 PRI, BRI, or T1 in any slot number can be assigned as the Primary reference 
(Program *42-1, DATA=1 for this PRI, BRI, or T1).
If a malfunction occurs and Primary reference synchronization is lost, the DK424 automatically 
switches modes and synchronizes to the Secondary reference, provided that there is another PRI, 
BRI, or...

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RPTU Call Monitoring (PRI)
Strata DK I&M 5/9914-13
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The Secondary reference is activated if the Primary reference fails. The DK424 automatically 
switches over to the Secondary reference PCB by opening its synchronization circuit (SS
1) and 
closing the synchronization circuit (SS
2). When this occurs, the digital voice or data path of 
the DK424 is synchronized to the Line 2 clock source.
If the path is not synchronized to the Stratum – 1 clock source, calls connected...

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RPTU Call Monitoring (PRI)
14-14Strata DK I&M 5/99
Figure 14-9 Start-up and Synchronization Sequences
/*-------------------------*/
  Copyright(C) 1997
  TOSHIBA Corporation
  All rights reserved
  RPTU Ver.1G
  [Reset]
/*-------------------------*/
00;00 016 Act.       (F1)
/*-------------------------*/
  Copyright(C) 1997
  TOSHIBA Corporation
  All rights reserved
  RPTU Ver.1G
  [Reset]
/*-------------------------*/
00;00 016 Act.       (F1)
00;09 634 LOS        (F3)
00;12 109 Act....