Chapter 1. System Overview and Modes of Operation
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LEDs
Light Emitting Diode (LED) circuits activate the LEDs for the current status of alarms,
operation modes, and switches.
Clock Select
The clock select function provides independent T1 clock selection options for T1-1 and
T1-2 as follows. Only in a drop and insert or dual channel bank configuration is this valid.
• Recovered clock T1-1
• Recovered clock T1-2
• Internal Stratum IV (1.544 MHz) clock source
• External clock with the backplane DB-9 Sync I/O connector
• Slot 2 synchronization source
Frequency Synthesizer
The frequency synthesizer produces a 1.544-MHz Stratum IV clock. It can synchronize
an external clock input that is 8 kHz or greater, and a multiple of 1600 Hz up to 1.544
MHz. The external clock is from either the backplane Sync I/O or the Slot 2
Synchronization source; selection is under software control.
Advanced Multiplexer Control Unit (AMCU)
The Advanced Multiplexer Control Unit (AMCU) is a two-circuit board assembly, comprising the
control functions of the D/I Mux III system with the SNMP feature. It is incompatible with all
releases of NCC products, and does not support Coastcom proprietary Machine Machine
Language (MML). For information on downward compatibility with CCU releases, contact
Coastcom’s Application Engineering Department.
The AMCU is comprised of a motherboard and a sub-board, offering the following features.
• Software download capability in FLASH ROM via a PCMCIA-compatible FLASH memory
module
• Support of all current line cards via the provisioning bus physical interface and protocol
• Current D/I Mux III control by dumb terminal, and PC terminal programs
• Ethernet 10Base-T port for SNMP manager and Telnet terminal emulation over a LAN
AMCU Motherboard Circuit Description
The following section lists and describes the various components of the AMCU module.
Microcontroller
The microcontroller, running a real time multi-tasking operating system, controls all the
functions of the AMCU, provides alarm integration, processes user commands, and issues
commands to other provisionable smart units over the RS-485 provisioning bus.
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