Toshiba CTX28 manual Rddu Direct Inward Dialing Line Interface Unit, Rddu Installation

PCB Installation

RDDU – Direct Inward Dialing Line Interface Unit

RDDU – Direct Inward Dialing Line Interface Unit

Circuits per PCB: four DID lines

Interfaces with: DID (one or two-way) lines

Older Version(s): none

The RDDU provides four Direct Inward Dialing (DID) lines, each of which can have a single office code along with a block of extensions.

Each extension can be assigned to ring a station [DN] that appears on one or multiple stations, Distributed Hunt or ACD Group, or an external telephone number selected in system programming. This enables calls over the same line to be routed to different stations or groups of stations. An extension can also be assigned to ring the maintenance modem. Each RDDU can be set for either wink start or immediate. All RDDU lines support DNIS and ANI features.

RDDU controls, indicators, and interface connectors are shown in Figure 6-21and described in Table 6-14.

RDDU Installation

Note Switches are factory-set to the 0 (0 dB signal level drop) position.

1.If the KSU is located within one mile of the PBX or CO, set dB Pad switches SW101 through SW401 to the 3 (-3 dB signal level drop) position to control excessive loudness resulting from close proximity to the PBX or CO.

2.Sensitivity jumpers P101~P401 are used mostly for dial pulse operation, to adjust for dial pulsing at different loop lengths. If close to the central office, the sensitivity should be set for low (L); as the loop length increases, it should be set to medium (M), then high (H).

3.Insert the RDDU (component side facing right) into the appropriate slot and apply firm, even pressure to ensure proper mating of connectors.

4.After installing the RDDU, gently pull the PCB outward. If the connectors are properly mated, a slight resistance is felt.

Table 6-14 RDDU Controls, Indicators, and Connectors

Control/Indicator/	Type of Component	Description
Connector
Pad switch SW101 (circuit 1)
Pad switch SW201 (circuit 2)	3-position slide switch	Enables -3 dB signal level drop for line circuit.
Pad switch SW301 (circuit 3)
Pad switch SW401 (circuit 4)
J1 connector	Modular connection	Interface connector for DID line circuits 1 & 2
J2 connector	Modular connection	Interface connector for DID line circuits 3 & 4
DID line circuit 1 CD122	Red LED (top)	Lights to indicate line circuit is in operation.
DID line circuit 2 CD222	Red LED
		(Trunk indicator will not light unless RDDU is
DID line circuit 3 CD322	Red LED
		connected to a DID line.)
DID line circuit 4 CD422	Red LED (bottom)
Jumper plug P101
Jumper plug P201	3-terminal jumper plug	Adjusts for dial pulsing at different loop lengths.
Jumper plug P301
Jumper plug P401

6-28 Strata CTX I&M 06/04