Toshiba Strata Dk14, Dk40i, Dk424 Installation And Maintenance Manual

DK424 T1
Flowchart Symbols
Strata DK I&M    5/996-21
DK424 T1
Table 6-2 RDTU T1 Error Record
Notes
lLatest DK424 Power On/Off Reset: Use this column to record whether the DK424 Power was 
reset On or Off, and the date and time that it was reset.
lUse the Synchro Bit Error, Bipolar Violation Error, Slip Error, and CRC Error columns to 
record the error number, and the date and time that they occur.
Flowchart Symbols
Five symbols are used in the flowcharts, 
which are identified in Figure 6-11.
Customer:...

DK424 T1
Flowchart Symbols
6-22Strata DK I&M    5/99
Go to
1
1
1676
RDTU LED Indicators
Busy (on)
FALM (on)
MFALM (on)
YALM (on)
BALM (on) Top
LED
PSYNC (on or off)
SSYNC (on or off)
Busy (on)
No alarms; 
synchronization is
achieved
No alarms; 
synchronization is
achieved
MFALM (on)
(only)
YALM (on) Bottom
LED
The fault is not
classified, contact 
your technical 
support group.YesStart The
problem is: the RDTU
will not synchronize with the
far end
T1.Go to
chart 2
The
problem is: no
dial tone on CO...

DK424 T1
Flowchart Symbols
Strata DK I&M    5/996-23
DK424 T1
Possible causes: No
carrier from far end; 
defective CSU, NIU, or 
RDTU; cable problems.
Is
fault cleared
?
Yes NoCheck RDTU/CSU/NIU
cabling per “RDTU Cable
Installation.”
Run DK system programs
per “RDTU (T1) System
Programming”.
Correct as necessary.
Perform RDTU self test
per “RDTU Loop Back Testing.” Before disconnecting CSU
from Telco line, notify the
T1 provider. You should also 
notify the provider before
connecting the CSU.
Did
RDTU...

DK424 T1
Flowchart Symbols
6-24Strata DK I&M    5/99
No
1681
Is
there more
than one RDTU
installed
?No
Slip problems cause 
periodic clicking on the 
talk path. Clicks can occur 
many times (severe case) 
during a call or only a few 
times during a 24-hour 
period.
Slips occur when 
synchronization timing is 
lost for an instant and then 
recovers.
Monitor slips using 
“T1ERR” function in 
DK280 remote 
maintenance DUMP 
mode.
One example of a slip fault 
when using more than one 
RDTU T1 span is...

Strata DK I&M    5/997-1
DK40i/DK424 Universal 
Slot PCBs
DK40i/DK424
Universal Slot PCBs7
This chapter contains information on Printed Circuit Boards (PCBs) which can be used in the 
universal slots of either the Strata DK40i Expansion KSU or the Strata DK424 cabinets. Although 
the system architecture of these systems is very different, the PCBs described in this chapter are 
common to both systems.
Important!When installing these circuit boards in the DK40i Expansion KSU, you must install 
them in the...

DK40i/DK424 Universal Slot PCBs
PCB Compatibility
7-2Strata DK I&M    5/99
PIOU2, 
PIOUS2X X Option Interface Units
PSTU X X (See RSTU2 for installation/programming instructions.)
RATU X Attendant Console Interface Unit
RCIS X X Adds four additional Caller ID lines to RCIU2.
RCIU1 X (See RCIU2 for installation/programming instructions.)
RCIU2 X X Caller ID Interface
RCMSAdds two ports per card (maximum of two) to E911 
CAMA Trunk Direct Interface card (RMCU)
RCOS X XAdds four loop start lines. (See RCOU...

DK40i/DK424 Universal Slot PCBs
PCB Chapter Layout
Strata DK I&M    5/997-3
DK40i/DK424 Universal 
Slot PCBsPCB Chapter Layout
Each PCB outline begins with the PCB’s designation and title (the outline appears in the chapter in 
alphabetical order by designation). A brief synopsis of the PCB appears next and includes a 
notation of the system(s) that the PCB can be used in, the circuits supplied by the PCB, what 
equipment the PCB interfaces with, and a list of the PCB’s older version(s) with a brief...

DK40i/DK424 Universal Slot PCBs
PCB Chapter Layout
7-4Strata DK I&M    5/99
KCDU
CO Line/Digital Telephone Interface Unit
System:DK40i Expansion KSU
Circuits per PCB:two CO loop start/four digital telephone circuits
Interfaces with:central office loop start lines
digital telephones (with or w/o RPCI-DI or ADM)
PDIU-DS
DDCB
cordless digital telephone (DKT2004-CT)
Older Version(s):none
One or two KCDU PCBs may be installed in the Expansion KSU. For controls, connectors, and 
indicators, see Figure 7-1 and...

DK40i/DK424 Universal Slot PCBs
PCB Chapter Layout
Strata DK I&M    5/997-5
DK40i/DK424 Universal 
Slot PCBs
Table 7-1 KCDU Controls, Indicators, and Connectors
Control/Indicator/ConnectorType of ComponentDescription
CO line circuit 1
indicator SW501Red LED
Lights to indicate CO line circuit is in operation.
CO line circuit 2
indicator SW601Red LED
J7 connectors Modular connector Interface connector for CO line circuits,1 and 2.
PAD switch SW501 Two-position slideEnables 3 dB signal level drop for CO...

DK40i/DK424 Universal Slot PCBs
PDKU2 Digital Telephone Interface Unit
7-6Strata DK I&M    5/99
PDKU2
Digital Telephone Interface Unit
System:DK40i Expansion KSU, DK424
Circuits per PCB:eight digital telephone circuits
Interfaces with:digital telephones (with or w/o RPCI-DI or ADM)
DDSS console (circuit 8 only)
PDIU-DS (must have dedicated circuit)
DDCB (circuit 5 only–ports 004, 012, 020, and 028)
cordless digital telephone (DKT2004-CT)
DKT2001 single line digital telephones (see Note below)
Older...