T1
Slot Assignments
6-2 Strata CTX I&M 10/02
RDTU - T1 Interface Unit
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. The Strata CTX can support up
to eight RDTU2 or RPTU2 PCBs total.
RDTU controls and interface connectors are shown in Figure 6-2 and described in Table 6-1.
The RDTU requires installation of a customer-provided Channel Service Unit (CSU). Refer to
“Installation Guidelines” on page 6-4 for CSU installation.
Testing procedures (local loop back and remote loop back) are in “Loop Back Testing” on page
6-10.
SW1 Equalizer Switch and Loop Back Jumpers (Internal
Option)
The distance between the Strata CTX 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:
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 page 6-5).
Mode
Feet from Strata
CTX
S1 S2 S3 S4 S5 S6 S7 S8
Short 0~150 On Off Off Off Off Off Off N/A
Medium 151~450 Off On Off On Off On Off N/A
Long 450~655 Off Off On Off On Off On N/A
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