Specifications

Theory of Operation
150 025-9035AA
preliminary set-up work and then runs the file “custboot.bat”, which sets up the Series
2000 for paging by loading the paging software from the hard disk and launching its
execution. The CPU first flashes the TMP, COM B, COM A, and T4 through T1 LEDs,
and then sets the T1 through T4 LEDs to reflect the positions of switches C1 through C4.
The paging software then initializes each peripheral (Trunk, Station, Voice, Modem, etc.)
card and loads its operating firmware from hard disk. Specific firmware filenames and
operating parameters (valid telephone blocks, station IDs, etc.) are tailored for each card
slot by the configuration file. Since the firmware is stored on hard disk and not in Read-
Only-Memory, Zetron can update any installed terminal with just a telephone call.
As firmware is loaded into an interface card, the card’s SELECT light comes on. Station
cards (702-9441) also blink their TEST 1 light; Trunk cards (702-9117) blink their TEST
3 light. The paging software causes the SELECT and TEST light to behave this way until
firmware loading is complete (8 to 15 seconds) for that card. Once all firmware is loaded,
and the CPU has tested the cards for proper operation, the Series 2000 Terminal goes “on-
line” for paging. The CPU continually polls the microprocessors on each interface cards
for any required service. The distributed multiple microprocessors of the 2000 Series
dedicates intelligence right where it is needed. Each processor guarantees instant service
to a telephone caller or radio. Multiple processors also mean that as the system is
expanded with more cards, more computer power is also added to keep throughput high
and clients happy.
System Operation
CPU Indicators
During normal operations, many of the LEDs on the CPU indicate various aspects of
system operations. The DMA LED indicates DMA transfers, these include data file reads
and writes as well as voice file transfers. The EMS LED indicates accesses to the EMS
memory, used by all systems. The MDM LED lights when ZlinkW is active on the
Modem port, as well as the COM A LED for the local connection port (if installed). The
LED will be on with short periods of darkness when the link is transferring data. When the
link is connected but idle, it will be mostly dark with a short flash on every two to four
seconds. The TMP LED will light if the terminal is operating outside of its temperature
range. The RST LED will be on whenever a CPU reset is occurring. The FLT LED is on
whenever a fault condition has been detected, and after a reset but before the system has
booted.
Idle
After all cards are initialized and operating parameters loaded, the system does its
housekeeping on the hard disk and goes into the normal idle state. It scans each interface
card looking for incoming calls from the Trunk cards and outgoing page requests from the