Toshiba CTX28 Rdsu Digital/Standard Telephone Interface Unit, Installing Rsts Internal Option

PCB Installation

RDSU – Digital/Standard Telephone Interface Unit

RDSU – Digital/Standard Telephone Interface Unit

Circuits per PCB: (with RSTS) four standard telephone (circuits 1~4)/four digital telephone (circuits 5~8) (without RSTS) two standard telephone circuits (1 and 2)/four digital telephone circuits

Interfaces with: digital circuits (see PDKU) digital telephones

standard circuits standard telephones voice mail ports off-premises stations other similar devices alternate BGM source

auto attendant digital announcer message waiting lamp

Older Version(s): none

An optional Standard Telephone Interface Subunit (RSTS) can be attached to the RDSU to provide two more standard telephone ports (circuits 3 and 4).

RDSU and RSTS controls and interface connectors are shown in Figure 6-22. RDSU interface connectors are described in Table 6-15.

Note For the system to recognize the DTMF tones generated by incoming DID lines a DTMF Receiver Unit (RRCS -4, -8, or -12) must be installed on the processor PCB.

Installing R48S Ring Generator (Internal Option)

An optional R48S unit can be connected to the RDSU or RSTU to change the standard telephone loop voltage from -24VDC to -48VDC, extending the standard telephone circuit loop length (including the resistance of the phone) from 600 ohms to 1200 ohms. The features provided by the R48S apply to the RSTS circuits as well as the basic RDSU standard telephone circuits.

To install the R48S on the RDSU

Mate the R48S connectors R6 and R7 with the RDSU connectors R6 and R7. RDSU connectors P6 and P7 are positioned to allow installation of the R48S only in the proper position (Figure 6-5).

Installing RSTS (Internal Option)

Mate the RSTS connectors P2~P5 with the RDSU connectors P2~P5. RDSU connectors P2~P5 are positioned to allow installation of the RSTS only in the proper position (Figure 6-22).

RDSU Installation

1.Ensure the SSTU subunit and optional subassemblies are securely attached to the RDSU (Figure 6-22).

WARNING! The protective shield on the back of the RDSU is designed to protect the installer from potentially hazardous ring voltage. Do not remove this shield.

2.Insert the RDSU into the appropriate slot, and apply firm, even pressure to ensure proper mating of connectors.

6-30 Strata CTX I&M 06/04