Toshiba CTX28 manual RDTU1 & 2 T1 Interface Unit, RDTU1 & 2 Installation, Ctx

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RDTU1 & 2 - T1 Interface Unit

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 8-7and described in Table 8-12.

The RDTU requires installation of a customer-provided Channel Service Unit (CSU). Refer to “CSU Installation” on page 8-19for 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.

Set the SW1 switch per Table 8-11.

Table 8-11 RDTU1 & 2 Equalizer Switch and Loop Back Jumpers

Mode	Feet from Strata	S1	S2	S3	S4	S5	S6	S7	S8
	CTX
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

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 8-19for loop back testing procedures.

See “SW1 Equalizer Switch and Loop Back Jumpers (Internal Option)” on page 8-15for 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 2-37for RDTU slot assignment recommendations.) (See Figure 8-6.)

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Strata CTX I&M 06/04 8-15