TOSHIBA BSTU Standard Telephone Interface Unit (Circuit card)
8Circuits per BSTU card
Interfaces with: standard analog telephones, fax, voice mail ports or off-premises stations
Can also provide alternate BGM sources, or auto attendant digital announcer
Can send a message waiting lamp signal to standard analog telephones with message waiting lights.
Older Version(s): RSTU, check with www.CableSupply.com
The BSTU and RSTU are basically the same and are interchangeable. Ringer Capacity for the
BSTU is three telephones or devices per circuit. RSTU 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 CIX100.
DTMF receivers are standard on CIX670 processors).
BSTU and RSTU3 provides Message Waiting (MW). RSTU1 and RSTU2 do not provide MW.
R48S -48 Volt Supply Subassembly Installations 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 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.
BSTU Installation
Note RSTU can be substituted for BSTU in these instructions.
1. Make sure the factory-installed SBSS (BSTU subunit) or SRSS (RSTU subunit) is securely
attached to the BSTU or RSTU.
2. Insert the BSTU (component side facing right) into the appropriate slot, and apply firm, even
pressure to ensure proper mating of connectors.
3. After installing the BSTU, gently pull the BSTU outward. If the connectors are properly mated,
a light resistance is felt.
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.
All Toshiba circuit cards should be installed by a Toshiba trained and certified authorized Dealer. To find a dealer near you go to www.enova.us or www.toshibaphones.Net
Note When installing the RSTU3 into an existing system, system power must be cycled only if the
MW mode (P11) is changed.
To learn more about how to cable a 50 pin Amphenol connecter (AKA 25 pair cable) see www.HowToCable.com or www.CableSupply.com .Also check our site for the Toshiba General Description guide.
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