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RDTU1 & 2 - T1 Interface Unit
Strata CTX I&M 06/04 8-15
RDTU1 & 2 - 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 8-7 and described in Table 8-12.
The RDTU requires installation of a customer-provided Channel Service Unit (CSU). Refer to
“CSU Installation” on page 8-19 for CSU installation.
Testing procedures (local loop back and remote loop back) are in “Loop Back Testing” on page
8-19.
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.
³ Set the SW1 switch per Table 8-11.
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 8-6).
RDTU1 & 2 Installation
1. Set jumper wire plugs P1 (LB), P2, P3, and P4 to the Off position. See “Loop Back Testing” on
page 8-19 for loop back testing procedures.
See “SW1 Equalizer Switch and Loop Back Jumpers (Internal Option)” on page 8-15 for the
appropriate SW1 equalizer switch setting.
2. Insert the RDTU (component side facing right) into the appropriate slot and apply firm, even
pressure to ensure proper mating of connectors. (See “Worksheet 6: Strata CTX670 Cabinet
Slots” on page 2-37 for RDTU slot assignment recommendations.) (See Figure 8-6.)
Table 8-11 RDTU1 & 2 Equalizer Switch and Loop Back Jumpers
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