Strata Airlink Wireless Interface Unit (Rwiu); Co Line/Digital Telephone Interface Unit (Kcdu) (Dk40I Only); Electronic Telephone Interface Unit (Peku); Standard/Electronic Telephone Interface Unit (Pesu) - Toshiba Strata DK14 General Description Manual

Universal Slot PCBs
Station PCBs

Strata AirLink Wireless Interface Unit (RWIU)

The RWIU interfaces the DK40i and DK424 with the Strata AirLink Telephone wireless system.
The card functions as a protocol converter between the Base Stations and the PBX. It has four
digital circuits that connect to four Base Stations using industry standard RJ11 jacks. Roaming and
handoff functionality are present between all four Base Stations.

CO Line/Digital Telephone Interface Unit (KCDU) (DK40i only)

The KCDU provides two analog loop start CO line circuits and four digital telephone circuits. The
CO line circuits offer all of the features that the Base TCOU and the RCOU line circuits provide.
The digital telephone circuits can support every peripheral (except for the DDSS console) that the
PDKU2 and a Base KSU digital circuit can support. Up to four KDCU PCBs can be installed in
the DK40i Expansion Unit.
Note The RCIU2 Caller ID Interface Unit is required to add Caller ID with the KCDU PCB.

Electronic Telephone Interface Unit (PEKU)

The PEKU provides eight electronic telephone circuits that can interface with electronic
telephones, an alternate BGM source, a Direct Station Selection Console (HDSS), an external
amplifier for DISA or two-CO line Conferencing.

Standard/Electronic Telephone Interface Unit (PESU)

The PESU offers two standard and four electronic telephone circuits. Its standard circuits support
the same devices as the KSTU2. Its electronic circuits interface with the same peripherals as the
PEKU, except for the HDSS console.
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.
Off-hook Call Announce Upgrade Unit (EOCU)
Electronic telephones connected to PEKU and PESU PCBs can receive speaker Off-hook Call
Announce (OCA)—internal [DN] calls over their speaker while they are on another call—if the
PCBs are equipped with an EOCU. Digital telephones also support this function, but do not require
an EOCU in the KSU. Unlike digital telephones, electronic telephones cannot receive handset
OCA.

Standard Telephone Interface Unit (RSTU2)

The RSTU2 has eight circuits that can support single-line devices (one device per RSTU2 port).
Besides rotary and DTMF standard telephones, the RSTU2 can support the Strata AirLink
Wireless analog system, fax machines, dictation equipment, modems, a separate BGM source, off-
premises stations, Toshiba Stratagy and VP voice mail systems, and digital announcement devices
for optional built-in AA or ACD.
This PCB also supports the Message Waiting feature on standard telephones that are equipped with
a 90VDC neon message waiting lamp.
The RSTU2 also provides an 80V RMS sine wave ring generator and has interface connectors for
an optional R48S subassembly that increases the maximum possible station loop length from 600
to 1200 ohms.
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