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PRODUCT.TXT
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1991-04-05
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17KB
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South Coast Engineering Services
P. O. Box 3000-187
Santa Barbara, CA 93130
(805) 681-7327
(805) 964-6343 Fax
Ring Count/Reset Device Product Specification
Copyright Notice
All rights to the hardware, the schematics and circuit design
belong to the below named company. It cannot be reversed
engineered for your personal gain nor may the rights to it be
sold to another entity without prior permission of the below
named company.
The hardware, hardware design, schematics and circuit design, and
all documentation are Copyright (C) 1991 by:
South Coast Engineering Services Company
1.0 DOCUMENT PURPOSE
This document specifies the design and performance requirements
of the South Coast Engineering Services Ring Count/Reset PCB
product.
1.1 Assumptions
All of the reference documents specified below, or otherwise
implied, are an integral part of this specification.
Throughout this document, signals which are active low true will
be denoted by a suffixed "*". Signals which are active high
true will have no notation.
The PC assembly will be referred to as the "Ring Count/Reset
Device".
2.0 REFERENCE DOCUMENTS
The following list of documents will comprise the total required
for this specification.
Description/Title Source/Document Name
1. IBM Technical Reference Manual IBM/1502243
2. Ring Count/Reset PCB, Schematic 7000-0100
3. Ring Count/Reset PCB, Assy Dwg. 7000-0101
3.0 PCB DESCRIPTION
3.1 General Description
The Ring Count/Reset Device is designed to be installed in any
spare slot of an XT, AT or compatable computer. The card
provides two RJ11 telephone connectors for direct connection to
the phone line, and two 2-pin connectors for connecting to the
system 'Reset' signals. Jumpers on the card set the rings-
before-reset count, as well as the holdoff period for
long system boot-up times.
Functionally, the card counts incoming ring signals, generates
CPU hard-resets for the host system, and blocks incoming ring
signals during boot-up
time.
Two LEDs indicate CPU-Reset and Ring Holdoff signal status. A
two-pin
header is provided for test or setup purposes. A push button
(normally open) can be connected to this header to simulate a
'ring' signal. This may be useful for determining jumper
configuration during the initial setup.
3.2 Product Features.
o Not dependent on CPU operation.
o Uses no memory.
o Simple installation and setup.
o Fail safe mode.
o XT/AT Computer compatable.
o Two RJ11 Telephone Jacks.
o Optically-Isolated Telephone Interface.
o Two Status LEDs
o Jumper Selectable Ring Count (Rings before Reset).
o Jumper Selectable Ring-Holdoff (Boot Time Delay).
o Two CPU-Reset Connectors.
o Pushbutton simulation of telephone Ring signal.
4.0 FUNCTIONAL DESCRIPTION
This section provides a complete operational description of the
Ring Count/Reset Device.
4.1 Architecture
The internal structure of the Ring Count/Reset Device as shown
in Figure 4.1 consists of four major functional blocks:
A. Ring Detection and Filtering.
B. Ring Holdoff Timer.
C. Ring Counter and Reset Control.
D. Ringing Timer and Count Load One-Shots.
+----------------------------------------------------------+
| |
| |
| Ring Opto Ringing Count |
| Detect Isol Filter Timer Load |
| ++ +--+ +-+ +-+ +--+ +--+ |
| J1||■| | | |---| | | | | | |
| ++||A |--|A| |A|-■-|D |-■-|D |LOAD* |
| ++|| | | | +-| | | | | | | |+ |
| J2||+| | +-+ | +-+ | +--+ | +--+| |
| ++ +--+ | | | | |
| | | | | |
| | | | | Ring |
| | | | |Counter Reset |
| | | | | +--+ Control |
| Holdoff | | | +-| | +--+ ++CPU |
| Timer | | | CLR* | | | |-||Reset |
| E5+ +--+ | | +-------| | | | ++ |
| E6+-| |-+ | RING* |C |-■-|C | ++Reset |
| E7+ |B | +--------------| | | | |-||Button |
| | | E1+ | | | +--+ ++ |
| +--| | E2+--| | | |
| | +--+ E3| +--+ | |
| | E4+ | |
| | HOLDTRIG | |
| +---------------------------------+ |
| |
| |
+----------------------------------------------------------+
Figure 4.1 Ring Count/Reset Block Diagram
4.2 Signal Flow
(Confidential)
4.3.1 Circuit Operation
(Confidential)
4.3.2 Noise Filter
(Confidential)
4.4 Dual Timers
(Confidential)
4.4.1 Ringing Timer
(Confidential)
4.4.2 Count Load Timer
(Confidential)
4.5 Ring Counter
(Confidential)
4.5.1 Circuit Operation
(Confidential)
4.6 Ring Holdoff
(Confidential)
4.6.1 Circuit Operation
(Confidential)
5.0 INTERFACE CONNECTORS
5.1 Connector Organization
The Ring Count/Reset Device has five on-board connectors. The
host interface connector provides DC power to the card, a dual
port modular telephone connector provides direct connection with
the telephone line, and two 2-pin connectors tie to the host
system 'Reset' signals. Finally, a 2-pin test connector allows
ring signal simulation.
5.2 Host Interface Connector
This card edge connector is used only to supply +5 Volts to the
Ring Count/Reset circuits. No other voltage is required on the
card. The connector pinout is defined in Table 5.1 below.
+--------------------------------+
| Signal Pin | I/O | Signal Name |
|------------+-----+-------------|
| B1 | P | Ground |
| B3 | P | +5 Volts |
| B10 | P | Ground |
| B31 | P | Ground |
+--------------------------------+
Table 5.1 Host Interface Connector
5.3 RJ11-C Connectors
These two connectors (within one housing) are 6 position, 2 pin
modular jacks used to connect directly to the public telephone
network. The jack labeled 'LINE' ties the Ring Count/Reset
Device to the telephone line. The jack labeled 'PHONE' couples
the card to other telephone compatable equipment, i.e., a Modem.
The two jacks are tied together, with pins 3 and 4 on J1
connected to pins 3 and 4 on J2.
5.4 System Reset Connectors
P1 and P2 are 2 pin connectors for connecting to the host reset
signals. Both are connected in parallel; one ties to the host
CPU motherboard reset input pins; the other connects to the front
panel 'Reset' button (if used).
5.5 Setup Connector
P3 is a 2 pin connector used during initial setup to help
determine the correct jumper selection. To use this feature,
temporarily connect the host system reset button to P3. Pressing
the reset button will simulate an incoming ring signal. Due to
the ring signal filter on the card, press the button slowly
(approximately twice per second) to insure a proper
count.
6.0 SPECIFICATIONS
6.1 Performance
The Ring Count/Reset Device does not communicate with the Host
computer through the I/O channel connector. The card provides
stand-alone performance without host intervention.
6.2 Power Requirements
The Ring Count/Reset Device requires only five volts DC, at
approximately 100mA. Power for the card is provided by the host
computer I/O channel connector, as defined in the table below.
+-------------------------------------+
| Voltage | Current | Pin |
|--------------+--------------+-------|
| +5Vdc +/-5% | 0.1 amps max.| B3 |
| Ground | 12 | B1 |
| Ground | 11 | B10 |
| Ground | 10 | B31 |
+-------------------------------------+
Table 6.2 Power Requirements
6.3 Physical
Form Factor...........: IBM PC
Length................: 4.30 in.
Width.................: 0.60 in.
Height................: 4.20 in.
Table 6.3 Physical Dimensions
The location of connectors and other critical dimensions are
indicated on the assembly drawings mentioned in the references.
6.4 Environmental
Ambient Temperature....................: 0-55 Deg. C.
Relative Humidity (non-condensing).....: 10% - 95%
Air Flow at 1/2" from component surface: 100 linear ft/min.
Altitude (operating)...................: 10,000 ft. max.
Altitude (storage).....................: 15,000 ft. max.
Table 6.4 Environmental Specifications
6.5 Electrical Specifications
6.5.1 DC Characteristics
The PC assembly utilizes standard TTL logic levels except for the
ring detection IC, which provides internal high voltage interface
and control.
6.5.2 AC Characteristics
This section will define the logic timing, with diagrams shown
in the following figures, which define the timing relationships
between various sections of the card.
Refer to Schematic Diagram for Appropriate Timing Diagram.
6.5.2.1 Telephone Line Impedance
During standby, the input impedance is approximately 1 megohm or
greater.
While operating, the impedance of the TCM1520A varies from 30
kilohms to 7 kilohms over the ring signal of 40 volts at 16 hertz
to 150 volts at 68 hertz and is reasonably independent of the
output load.
7.0 CONFIGURATION OPTIONS
The Ring Count/Reset Device can be configured to suit the needs
of the end user. All options are selected by jumpers E1 through
E7, and are outlined in this section.
7.1 Ring Count Selection
Jumpers E1 through E4 select the preload value for the Ring
Counter U2, as defined in Table 7.1 below. Note that a "1"
indicates an installed jumper.
+-----------------------------------------------------+
| Preload | # of Rings | Jumpers | |
| Count | to Reset | E4 E3 E2 E1| Comments |
|---------+------------+------------+-----------------|
| 0 | 13 | 1 1 1 1 | |
| 1 | 12 | 1 1 1 0 | |
| 2 | 11 | 1 1 0 1 | |
| 3 | 10 | 1 1 0 0 | |
| 4 | 9 | 1 0 1 1 | |
| 5 | 8 | 1 0 1 0 | |
| 6 | 7 | 1 0 0 1 | |
| 7 | 6 | 1 0 0 0 | |
| 8 | 5 | 0 1 1 1 | |
| 9 | 4 | 0 1 1 0 | |
| 10 | 3 | 0 1 0 1 | |
| 11 | 2 | 0 1 0 0 | |
|---------+------------+------------+-----------------|
| 12 | - | 0 0 1 1 | Invalid Setting |
| 13 | - | 0 0 1 0 | Invalid Setting |
| 14 | - | 0 0 0 1 | Invalid Setting |
| 15 | - | 0 0 0 0 | Invalid Setting |
+-----------------------------------------------------+
Table 7.1 Preload Count Jumpers
Note that the Preload Count value does not represent the number
of rings to be counted before a reset will occur, but rather,
what count value the counter will start incrementing from.
Remember that the first incoming ring will load the Preload Count
value selected, and subsequent rings will increment it.
To understand the sequence, try this exercise. When you hear
the first ring, say outloud what your selected preload value is
(your jumper setting). For each subsequent ring, add one to your
number and call it out again. When your number reaches eleven,
you know that the next ring will generate a CPU reset.
7.2 Ring Holdoff
Jumpers E5, E6 and E7 set the holdoff period to match the host
system boot-up time, as shown in the table below. Holdoff time
can be selected in 30 second increments, from disabled, to 3 1/2
minutes, as shown in Table 7.2 below. Note that a "1" indicates
an installed jumper.
+---------------------------------------------------+
| Holdoff | Total | Jumpers | |
| Time in | Network | | |
| Minutes | Resistance| E7 E6 E5 | Comments |
|---------+-----------+-----------+-----------------|
| 3.5 | 2.1 Meg. | 0 0 0 | |
| 3.0 | 1.8 Meg. | 0 0 1 | |
| 2.5 | 1.5 Meg. | 0 1 0 | |
| 2.0 | 1.2 Meg. | 0 1 1 | |
| 1.5 | 900 Kohm | 1 0 0 | |
| 1.0 | 600 Kohm | 1 0 1 | |
| 0.5 | 300 Kohm | 1 1 0 | |
| 0 | 0.0 Kohm | 1 1 1 | Holdoff Disabled|
+---------------------------------------------------+
Table 7.2 Ring Holdoff Configuration
8.0 INSTALLATION
Refer to DOC, Ring Counter/Reset Device Installation Instructions
SCES part number 8500-0101.
