Toshiba Strata Dk14, Dk40i, Dk424 Installation And Maintenance Manual

Strata DK I&M    5/996-1
DK424 T1
DK424 T16
This chapter covers information on using T1/DS-1 interfacing. It is available for the DK424. T1/
DS-1 interfacing is not available for the DK14 and DK40i.
Channelization
The Strata DK424 RDTU PCB provides T1/DS-1 interface for up to 24 channels. Each channel 
can be individually set for loop start, ground start, Tie, or DID line operation (voice only, not data 
lines). Each RDTU can be set in system programming to activate (1~8), (1~16), or (1~24) 
channels...

DK424 T1
RDTU T1 Interface Unit
6-2Strata DK I&M    5/99
RDTU
T1 Interface Unit
System:DK424
Circuits per PCB:8, 16, or 24 channels
Interfaces with:ground start CO lines
loop start CO lines
DID or Tie lines
Older Version(s): none
RDTU is configured for Tie or DID lines and an RRCS must be installed for DTMF operation. 
LEDs on the RDTU show a continuous status of RDTU operation.
NoteEach Tie or DID line decreases the system’s station port and CO line capacity by one.
A Strata DK424 system operating with...

DK424 T1
RDTU T1 Interface Unit
Strata DK I&M    5/996-3
DK424 T1
RDTU Installation
Installing an RDTU (T1) into a Strata DK424 requires a number of system programs to be run. 
Toshiba recommends running these programs in the order listed before actually installing the 
RDTU into the system. This allows the RDTU to function immediately, including self-check loop 
back testing and normal operation, when it is inserted into the system.
ä
To install an RDTU PCB
1. Set jumper wire plugs P1 (LB), P2, P3, and...

DK424 T1
RDTU T1 Interface Unit
6-4Strata DK I&M    5/99
6. Run Program 17.
©LED 01: For RDTU Tie lines, set LED01 to allow (ON) or deny (OFF) Page and Voice 
Announce on incoming calls to DK424 stations from the far end T1 Tie line stations. This 
option (LED01) does not apply to RDTU DID lines—Page and Voice Announce is always 
denied to incoming DID calls because of FCC “answer supervision” rules.
©LED 02 (Wink/Immediate): This assignment is for RDDU, REMU, and PEMU lines only; 
it does not apply to...

DK424 T1
RDTU T1 Interface Unit
Strata DK I&M    5/996-5
DK424 T1
transmission path (time-switch) is synchronized with the far end digital system transmission 
path. For proper T1 operation, the equipment at each end of a T1 span line must be 
synchronized. 
The DK424 time-switch is synchronized (as slave) to the T1 span equipment on the other end 
of the T1 line by the RDTU PCB designated as the Primary Reference in Program *42-1. 
When a RDTU is connected to a Telco or Long Distance Provider T1 span...

DK424 T1
RDTU T1 Interface Unit
6-6Strata DK I&M    5/99
1675
Synchronization
Circuit RDTU(2) (Secondary Ref)
Digital Voice Path
Synchronization
CircuitRDTU(3)
Span
Line 3
T1 Span Clock Not
Synchronized Properly with
Stratum 1 Clock Source Digital Voice PathOther
T1
Provider Span
Line 1Telco
Central
Office
T1
Span
Line 2AT&T
Long
Distance
T1Stratum 1
Clock
Source RDTU(1) (Primary Ref)
SS
1
SS2
SS3
DK Digital Transmission Voice Path
PDKU Digital
Telephone
PEKU Electronic
Telephone
RSTU Standard...

DK424 T1
RDTU T1 Interface Unit
Strata DK I&M    5/996-7
DK424 T1
If there are two RDTU PCBs installed, it is recommended not to install the Primary and 
Secondary Reference RDTU PCBs in the same DK424 cabinet if possible (although both 
Primary and Secondary Reference RDTU PCBs can be installed in the same cabinet). The 
Secondary Reference RDTU should also be connected to a Telco or Long Distance Provider 
T1 span (*42-2, Data = 2 for this RDTU). 
If the equipment on the other end of the DK424 T1 lines...

DK424 T1
RDTU T1 Interface Unit
6-8Strata DK I&M    5/99
RDTU Programming
The following programs select the number of channels supported by the RDTU and assign line 
operation for the individual channels.
Notes
lRDTU Tie lines can route per Program 04 [DN] assignment or Program 71 and 72 DNIS 
assignments (see Program 17, LED 05).
lRDTU DID lines can route per Program *09 assignments or Program 71 and 72 DNIS 
assignments (see Program 17, LED 05).
Program 03: Specify Code 71 for an 8-channel RDTU, Code...

DK424 T1
RDTU T1 Interface Unit
Strata DK I&M    5/996-9
DK424 T1
Program 71~74: These programs are used in place of Program *09 to assign DID/Tie/DNIS line 
ringing destinations.
Program 71 (1~5): Tie/DID DNIS assignment (optional used in place of *09. Also see Program 
04).
Program *71~*73: Tie/DID telephone/[DN] ring assignments.
Program 78: Use to assign special ringing of lines: includes Night Ring Over Page, DISA, Remote 
Maintenance via the Internal Maintenance Modem (IMDU), and Built-in Auto...

DK424 T1
Installation Guidelines
6-10Strata DK I&M    5/99
Installation Guidelines
1. Read “Channelization” on Page 6-1 before proceeding to Step 2.
2. Run RDTU T1 related system programs as described in “Applications” on Page 6-11.
3. Set P1 and P2, loop back jumper to the ON position for RDTU self test (see “RDTU Self Test” 
on Page 6-16). Refer to “Hardware and Cabling” on Page 6-13 for the appropriate SW1 
Equalizer Switch setting and set SW1 to the setting that matches the RDTU cable length.
4....