Filter
Top Products
INSTALLATION-DK8 KSU & PCB
SECTION 100-816-204
MARCH 1993
4-14
FIGURE 4-10
QSTU CONTROLS AND INTERFACE CONNECTORS
J4J1
J3
J5
J6
SW1
190 130
QSTS
QSTU
QSTS
FACTORY
INSTALLED
J2
Dual-Tone Multi-Frequency (DTMF) tones gener-
ated by a standard telephone (or any other device
connected to a standard telephone circuit (QSTU)),
and it is required for Direct Inward System Access
(DISA) calls. The QRCU circuits are also used to
detect busy tone for the Automatic Busy Redial
(ABR) feature and must be installed to allow ABR
to operate.
9.02 The QRCU is shown in Figure 4-11.
9.10 QRCU Configuration
9.11 The QRCU does not have to be configured for
operation.
9.20 QRCU Installation Procedure
9.21 Install the QRCU in accordance with the