Instruction manual

Strata CTX28 Overview
CTX28 Cabinet Slots
Strata CTX General Description 10/04 3
CTX28 Cabinet Slots
The CTX28 Cabinet has two dedicated slots
used for the GCTU system processor card and
GVMU optional Voice Mail circuit card. All
other optional interface cards plug onto the
Processor or the Motherboard.
CTX28 Processor
Each system operates with one processor
(GCTU1A) that installs in a dedicated slot of
the Cabinet. The CTX28 processor does not
require any licenses. This includes all items
(line/station ports, DTMF receivers, ABR
circuits, etc.) The processor incorporates the
following hardware features:
CPU/Memory
The processor uses a high-speed, 32-bit, RISC
processor, Dynamic Random Access Memory
(DRAM) working memory, Static Random
Access Memory (SRAM) with lithium battery
for memory back-up, and flash program
memory.
Large Scale Integrated (LSI) Circuits (no licenses required)
The processor has an LSI circuit that supports the following:
• 16 DTMF receivers.
• 16 Busy Tone (BT) detector circuits for Auto Busy Redial (ABR).
• 64 built-in conference circuits.
• Built-in, adjustable, digital volume PAD technology enables audio volume to be adjusted in
eight steps to compensate for conference and/or CO line network losses.
GCTU Processor Interfaces
Memory Protection Battery
If commercial AC power is lost or if a system is moved or stored without power, the processor has
an on-board battery that protects data and the customer’s programmed configuration from memory
loss. This information will be maintained in a powerless system for at least six years.
Relay Control Interface
An on-board terminal strip provides an interface to a normally open relay contact which can be
programmed to control a Night Bell, door lock or to mute BGM during an external page.
Figure 3 CTX 28 Interior