Northern Telecom DMS-100 Series Maintenance Manual page 234

9-4 List of terms
The passing of electrical energy from a statically charged body to a
discharged body or ground. Statically charged bodies may store several
thousand volts, which has potential to severely damage or even destroy static
sensitive electronic components such as Metal Oxide Semiconductor
devices.
HOC
Host Office Collector
An AMA data collection center that polls Central Offices in its region on a
prescheduled basis and compiles the collected data onto a magnetic tape.
The tape is used by the Revenue Accounting Office for computing customer
billing.
IC
Integrated Circuit
A series of interconnected active and passive electronic devices integrated
into a single semi-conductor substrate (typically silicone) or deposited on a
single substrate, and capable of performing one or more complete electronic
functions.
IOC
Input/Output Controller
An equipment shelf which provides an interface between up to 36
Input/Output devices and the Central Message Controller. The IOC contains
a Peripheral processor which independently performs local tasks, thus
relieving the load on the CPU.
MAP
Maintenance and Administrative Position
A group of components which provide a Man-Machine Interface between
OTC personnel and the DMS-100 Family. A MAP consists of Visual
Display Unit, voice communications module, testing facilities, and MAP
furniture.
MODEM
MOdulator/DEModulator
A device which modulates and demodulates signals for transmission and
reception, respectively, over communication facilities. A modem is used to
permit digital signals to be sent out over analog lines.
PIO
Port Input/Output
297-1001-537 Standard 01.02 December 1993