MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
10
January 2000
the CTU, handle protocols, and manage control signals and messages with handset(s) and data
devices. A logic and signaling processor in the main board includes a CODEC for analog and
digital conversions of voice signals. The CTU converter board contains the necessary frequency
synthesizers, up and down converters, and the QPSK modulator.
The most current CTU configuration accommodates 4800 bits per second data communications,
a satellite acquisition algorithm that speeds network access, and advanced service features. The
availability of advanced service features depends on the specific offerings of each service
provider, but can include:
♦
Call Line Identification (Caller ID) and Caller ID Restriction—Handset displays
the caller’s phone number or protects your phone number from such devices
♦
Connected Line Identification and Connected Line Restriction —Handset displays
the phone number of the party who you called or protects your phone number
from such display
♦
Call Transfer—Transfers a call in progress to a third party without any previous
connection
♦
Call Forwarding and Voice Mail—Forwards incoming calls to another number
(without ringing) or to a voice mailbox when your phone is busy or unattended
♦
Call Waiting—Notifies the user of an incoming call during a conversation and
allows switching between these calls
♦
Conference Calling—Allows conversations with several parties simultaneously
♦
Call Barring—Restricts placing one or more types of calls
♦
Alternate Account Charging—Allows billing to specific accounts for particular
phone calls
♦
Enhanced Fraud Protection—Requires a four digit PIN, that the service provider
assigns, to complete dialing
4.4 CTU Cradle and Junction Box
The cradle and junction box provide the appropriate interfaces for the basic handset and
accessories with the CTU. The handset cradle package (SZ130A) includes a clip mount with an
RJ-45 handset interface and the junction box (SZ350A) interface for accessories (PTT handset,
monitoring speaker, and hands free microphone).
