Telephone Systems General Description

Strata CTX670 Overview
CTX670 Processor PCBs
6 Strata CTX General Description 11/02
CTX670 Processor PCBs
The system operates with one set of processor PCBs (BECU/BBCU) that install in dedicated slots
of the Base Cabinet. The BECU/BBCU processor incorporates the following on-board hardware
features:
CPU/Memory
The CTX670 uses a high-speed, 32-bit, Reduced Instruction Set Computing (RISC) processor,
Dynamic Random Access Memory (DRAM) working memory, Static Random Access Memory
(SRAM) with lithium battery for back-up memory, and flash program memory.
Large-scale Integrated (LSI) circuits
The processor has LSI circuits that support the following:
• 16 built-in DTMF receivers; 32 available using the BEXS. For five or more DTMF receivers,
appropriate licenses are required. See “CTX670 License Control” on page 7.
• 16 built-in Busy Tone (BT) detectors for Auto Busy Redial (ABR); 32 available using the
BEXS
• 64 built-in conference circuits; up to 96 conference circuits are available using the BEXS. (See
Table 7 on page 13 for more information).
• 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.
Memory Protection Battery
If commercial AC power is lost or if a system is moved or stored without power, the processor has
an internal 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.
Music-on-hold/Background Music Interface
An RCA jack and volume control are built into the processor to interface with a Music-on-hold
and/ or Background Music source. With the CTX670, you can have up to 15 MOH/BGM sources
by adding:
• Up to two BIOU PCBs, each provides three MOH/BGM input sources
• An RSTU PCB that provides up to eight MOH/BGM input sources
SmartMedia Memory
The processor has an on-board SmartMedia card slot. A SmartMedia flash memory card can be
inserted to backup and restore customer program data. It also makes it easy to upload operating
system data for software upgrades and is used for maintenance functions (see “System Fault
Finding and Diagnostics” on page 66 for more details).