Toshiba CTX28 manual BSTU/RSTU Standard Telephone Interface Unit, BSTU/RSTU Installation

PCB Installation

BSTU/RSTU – Standard Telephone Interface Unit

BSTU/RSTU – Standard Telephone Interface Unit

Circuits per PCB: eight standard telephone circuits

Interfaces with: standard telephones voice mail ports off-premises stations other similar devices alternate BGM sources

auto attendant digital announcer message waiting lamp

Older Version(s): RSTU3, RSTU2, RSTU1

The BSTU and RSTU are basically the same and are interchangeable. Ringer Capacity for the BSTU is three telephones or devices per circuit. RSTU1, 2 and 3 allow one telephone or device per circuit.

Notes

•For the system to recognize the DTMF tones generated by a standard telephone (or any other device connected to a standard telephone port), a DTMF receiver unit must be equipped on the processor PCB (ARCS subassembly must be installed on ACTU processor of the CTX100. DTMF receivers are standard on CTX670 processors).

•BSTU and RSTU3 provides Message Waiting (MW). RSTU1 and RSTU2 do not provide MW.

R48S -48 Volt Supply Subassembly Installation

R48S is required for line loop resistance greater than 600 ohms. The maximum loop resistance allowed with 48S = 1200 ohms; without 48S = 600 ohms.

Mate the R48S connectors P6 and P7 (Figures 6-6~6-9) with the R48S connectors P6 and P7 on the BSTU or RSTU.

Note BSTU and RSTU connectors P6 and P7 are positioned so that the R48S only fits in the proper position.

	P7
P6	1374

Figure 6-6 R48S Interface Connectors

BSTU/RSTU Installation

1.Make sure the factory-installed SBSS (BSTU subunit) or SRSS (RSTU subunit) is securely attached to the BSTU or RSTU (Figures 6-8and 6-9).

WARNING! The shield on the back of the BSTU and RSTU is designed to protect you from potentially hazardous ring voltage. Do NOT remove this shield.

Note “RSTU” can be substituted for “BSTU” in these instructions.

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

PCB Installation

Strata CTX I&M 06/04 6-11