Sw1 Equalizer Switch And Loop Back Jumpers (Internal Option) - Toshiba Strata DK14 Installation And Maintenance Manual

DK424 T1
RDTU T1 Interface Unit
RDTU
T1 Interface Unit
System:
Circuits per PCB:
Interfaces with:
Older Version(s):
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.
Note Each Tie or DID line decreases the system's station port and CO line capacity by one.
A Strata DK424 system operating with an RCTUE/F can support up to eight RDTU PCBs.
RCTUC/D common control unit supports up to six RDTU PCBs. The RCTUB and RCTUBA/BB
support up to two RDTU PCBs. The RDTU cannot be installed in a system operating with the
RCTUA.
RDTU controls and interface connectors are shown in
The RDTU requires installation of a customer-provided Channel Service Unit (CSU). Refer to
"Installation Guidelines"
Testing procedures (local loop back and remote loop back) are in
6-16.

SW1 Equalizer Switch and Loop Back Jumpers (Internal Option)

The distance between the DK424 cabinets and the CSU (or other customer premise T1 circuit)
determines the setting of the SW1 Equalizer Switch. The SW1 switch consists of a bank of smaller
switches, S1~S7.
Set the SW1 switch as follows:
Mode
Medium
Note The maximum distance between the RDTU and the CSU or other T1 circuits can not be
more than 655 feet (see "RDTU to PBX T1 (Separated More Than 655 ft.)" on
6-2
DK424
8, 16, or 24 channels
ground start CO lines
loop start CO lines
DID or Tie lines
none
on Page 6-10
Feet from DK424
Short 0~150
151~450
Long 450~655
Figure 6-1
for CSU installation.
S1 S2 S3 S4
ON OFF OFF OFF
OFF ON OFF ON
OFF OFF ON OFF
and described in Table 6-1.
"Loop Back Testing" on
S5 S6 S7
OFF OFF OFF
OFF ON OFF
ON OFF ON
Page
Strata DK I&M
Page
S8
N/A
N/A
N/A
6-11).
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