Chapter 4 - Universal Slot Pcbs; Station Pcbs; Digital Telephone Interface Unit (Pdku2); Digital/Standard Telephone Interface Unit (Rdsu) - Toshiba Strata DK14 General Description Manual

Universal Slot PCBs
This chapter describes each of the PCBs that install into the universal slots of the Strata DK40i
Expansion KSU and the DK424 Base/Expansion Cabinets. The following paragraphs categorize
the cards according to their function.
Descriptions here apply to both DK40i and DK424 unless noted otherwise. The DK14 does not
support any universal slot PCBs.

Station PCBs

Feature subassemblies, such as the Standard Telephone Interface Subassembly (RSTS), are listed
below the associated PCB. For a list of available subassemblies, see

Digital Telephone Interface Unit (PDKU2)

The PDKU2 has eight digital telephone circuits that can support digital telephones (cordless as
well as corded), integrated PC interface data units for data calling and/or TAPI application, off-
hook call announce, DDSS consoles or DADMs for attendant stations that must handle a heavy
load of calls, and a DDCB for a variety of applications.
Each of these devices only requires one circuit except for the integrated PC interface unit or
DADM, which shares a circuit with the telephone to which they are connected.

Digital/Standard Telephone Interface Unit (RDSU)

The RDSU in its basic configuration has two standard telephone circuits and four digital telephone
circuits (cordless as well as corded). The standard telephone circuits can support the same devices
that the RSTU2 can, with the exception of standard telephone message waiting lamps.
The digital circuits can support the same devices as the PDKU, except for the DDSS console. The
RDSU can be equipped with an RSTS subassembly to provide two more standard telephone
circuits, and an R48S subassembly to increase the standard telephone maximum loop length.
DK40i – a K5RCU or K5RCU2 must be installed in the Base KSU to interpret DTMF tones
transmitted by devices connected to the standard telephone circuits.
DK424 – an RRCS must be installed on the common control unit to interpret the DTMF
signals for devices connected to the standard telephone circuits.
Standard Telephone Interface Subassembly (RSTS)
The RSTS attaches to the RDSU and adds two standard telephone circuits to the PCB. With the
RSTS installed, the RDSU provides four standard telephone circuits and four digital telephone
circuits. (RSTS does not support standard telephone message waiting.)
Strata DK General Description 5/99
Table 23 on Page 40.
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