standard telephone circuits. The KSTU, which can be installed in the STRATA DK16 Base Key Ser- vice Unit, has four standard telephone circuits; the PSTU, which can be installed in the DK16 Expan- sion Key Service Unit, has eight; and the PESU, which can also be installed in the DK16 Expansion Unit, has two (Circuits 1 and 2).

4TELEPHONE UPGRADES

4.00Digital and Electronic telephones can be upgraded for a number of features; there are no upgrades for standard telephones. Each of these upgrades shares a circuit with the telephone that it is connected to and is not considered a station.

4.10Digital Telephone Upgrades

4.11Digital telephones can be upgraded with the following subassemblies:

• Integrated Data Interface Unit (PDIU-DI/PDIU- DI2): A Digital telephone can be upgraded with a PDIU-DI/PDIU-DI2 to provide the telephone with data switching capabilities. 2000-series Digital Telephones use the PDIU-DI2, and 1000- series Digital Telephones use the PDIU-DI. PDIU-DI2 cannot be installed on a telephone if ADM is installed.

Add-on Module (ADM): A 2000-series Digital Telephone can be upgraded with an ADM to provide 20 Direct Station Selection buttons on STRATA DK16, or 10 DSS buttons, 8 speed dial buttons, one night transfer button and one all call page button on STRATA DK8. The 1000- series Digital Telephone models cannot support ADMs. ADM cannot be installed on a telephone if PDIU-DI2 is installed.

Off-hook Call Announce Upgrade (DVSU):A Digital telephone that must receive Off-hook Call Announce must be upgraded with a DVSU.

Loud Ringing Bell/Headset Upgrade (HHEU): A digital telephone can be upgraded with an HHEU to provide a dual interface for the Loud Ringing Bell feature and/or a headset. (Simulta- neously with PDIU-DI2 or ADM).

4.20Electronic Telephone Upgrades

4.21On STRATA DK16, electronic telephones can be upgraded with the following subassem- blies:

INSTALLATION-CONFIGURATION

SECTION 100-816-203

MARCH 1993

Off-hook Call Announce Upgrade (HVSU2 or HVSU/HVSI): An electronic telephone must be upgraded with the HVSU2 subassembly or the combined HVSU/HVSI subassemblies to re- ceive Off-hook Call Announce.

NOTE:

A PEKU or PESU PCB that supports elec- tronic telephones that must receive Off-hook Call Announce must be equipped with an EOCU.

Loud Ringing Bell/Headset Upgrade (HHEU): An electronic telephone can be upgraded with an HHEU to provide a dual interface for the Loud Ringing Bell feature and a headset simulta- neously.

5 CONFIGURATION EXAMPLES

5.00The following provides an examples of how to configure a STRATA DK8.

5.10Strata DK8 - Example 1 (Smalll Retail Store)

5.11Customer Requirements. A store needs two CO lines and four digital telephones.

5.12Analysis. The store's system hardware re- quirements are as follows:

Two CO line circuits for the CO lines.

• Four digital telephone circuits for the digital telephones.

5.13Conclusion. A standard Key Service Unit would be adequate in this case. The unit's stan- dard four digital telephone circuits and two CO line circuits could easily accommodate the store's needs and allow for future expansion.

5.20Strata DK8 - Example 2 (Home/Office)

5.21Customer Requirements. In addition to three CO lines, a home/office needs five digital tele- phones (three of which will have PDIU-DIs), a modem, a door phone, one facsimilie machine, Music-on-hold and Telephone Set Background Music.

5.22Analysis. The customer's requirements could be broken down as follows:

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Toshiba DK8, DK 16 manual Telephone Upgrades, Configuration Examples