LSI/SC Series
8 and 16 PORT loop start network interface for the SCBus
Features:
- Intelligent analog interface boards provides loop start network connectivity
to SCbus(tm)-based computer telephony systems
- LSI/81SC (8 ports) and LSI/161SC (16 ports) enable high-density applications
- SCbus' distributed switching permits inbound/outbound call re-routing,
both inter-board as well as intra-board
- Signaling functions such as loop seizure, current detection, and ring
are controlled and monitored through host-PC interface
- Tone signaling and outbound call progress analysis provided through
a subset of SpringWare(tm)-downloadable signal and call processing firmware
from Dialogic
- Toll quality voice encoding and decoding
- Support for Caller ID calling party number retrieval
- Transient protection circuitry for high reliability
Applications:
- Voice messaging
- Interactive voice response
- Voice/audio response systems
- Audiotex
- Operator services
- Telemarketing/call center
- Dictation
- Auto dialers
- Notification systems
- On-line data entry/query
The LSI/SC Series provides access to analog telephone lines for computer
telephony systems based on the industry standard SCbus. The LSI/SC series
consists of two products, the LSI/81SC and the LSI/161SC, which provide
8 and 16 independent analog loop start interface circuits. Voice and voice-band
signals are digitized and passed in real time between the analog telephone
network and the SCbus. On-board CODECs support either m-law pulse code modulation
(PCM) or A-law PCM with application selectivity.
The LSI/SC products are intelligent network interfaces containing a control
processor for handling loop signaling and automatically answering incoming
calls. Both LSI/SC products are ISA AT form factor boards that install in
a single 16-bit expansion slot.
The LSI/SC Product Series is intended for use where isolation voltage
requirements do not exceed 1500V. This includes the US, Canada, and Japan.
The LSI/SC boards are also suitable for use behind a customer premises switch.
Both the LSI/81SC and the LSI/161SC contain Digital Signal Processors
(DSPs), that provide a broad range of tone signaling capabilities. The added
features are actually a subset of Dialogic voice processing algorithms,
called SpringWare(tm). This SpringWare subset is downloaded to the on-board
DSPs on system initialization and provides 8/16 channels of nonblocked access
to tone signaling and outbound call progress analysis.
Configurations:
Up to 16 LSI/SC boards can be configured in a system with each board
sharing the same interrupt level. The maximum number of lines supported
is dependent on the host computer operating system, application, and the
host computer CPU and power supply.
The distributed switching architecture of the SCbus provides for a high
degree of flexibility when configuring systems. Any of the 8 or 16 analog
trunks can be routed to any of the SCbus' 1024 time slots. Additionally,
an incoming call on one time slot of the network interface can be rerouted
to an outbound call on another time slot.
Software Support:
The LSI/81SC and LSI/161SC are supported by Dialogic System Software
and SDK for MS-DOS(r), OS/2(r), UNIX(r), Windows NT(r) and Solaris(r).
Functional Description:
The LSI/81SC and LSI/161SC boards connect 8 and 16 analog (loop start)
telephone lines to 8 or 16 on- board call processing resources or to other
resources via the SCbus. This board provides
- interference suppression
- A/D and D/A conversion
- ring and on-hook/off-hook signaling control
- tone detection and generation
The signals from the 8 or 16 loop start telephone lines connected to
the LSI/81SC or LSI/161SC board first pass through a telephone line interface
that provides transient protection and EMI (electromagnetic interference)
suppression (see block diagram). These telephone line interfaces use reliable,
solid state hook switches (no mechanical contacts) and FCC-part 68 class
B ring detection circuitry. This FCC-approved ring detector is less susceptible
to spurious rings created by random voltage fluctuations on the network.
Each interface also incorporates circuitry that protects against high-voltage
spikes and adverse network conditions and allows applications to go off-hook
any time during ring cadence.
Each of two SC2000 chips transmit several lower speed data streams over
a single high speed channel. These chips also incorporate matrix switching
capabilities. Under control of an on-board control processor, an SC2000
chip can connect a call or an available external resource to any of the
1024 SCbus time slots. When the on-board call processing resources are used,
the telephony signaling data (ring and on-hook/off- hook) is extracted and
passed to the on-board control processor for processing. This processor
changes channel status based on the telephony signaling and communicates
channel events/status to the application via shared RAM and the host PC
ISA bus.
For outbound data, the DSP generates tones - DTMF or MF within limits
of product. The dual processor combination also performs outbound dialing
and call progress monitoring:
- goes off-hook
- dials out (makes an outbound call)
- monitors and reports results:
-line busy or congested
-operator intercept
-ring, no answer
-detect if a call is answered by a person (PVD), an answering machine (PAMD),
a facsimile, pager, or a modem
The on-board control processor controls all operations of the LSI/81SC
and LSI/161SC boards and interprets and executes commands from the host
PC. This processor handles real-time events, manages data flow to the host
PC to provide faster system response time, reduces PC host processing demands,
processes DTMF and telephony signaling before passing them to the application,
and frees the DSP to perform signal processing. This RAM interfaces to the
host PC via the ISA bus. All operations are interrupt-driven to meet the
demands of real-time systems. When the system is initialized, SpringWare
firmware to control all board operations is downloaded from the host PC
to the on-board code/data RAM and DSP RAM. This downloadable firmware gives
the board all of its intelligence and enables easy feature enhancement and
upgrades.
The board locator technology circuit operates in conjunction with a rotary
switch to determine and set nonconflicting software interrupt parameters.
This eliminates the need to set confusing jumpers or DIP switches.
TECHNICAL SPECIFICATIONS* |
| Analog network interface |
On-board loop start interface |
| Resource sharing bus |
SCbus |
| Control microprocessor |
Intel(r) 80486GX @ 28.5 MHz, 0 wait state |
| Digital signal processors |
Two Motorola DSP56002 @ 65.5 MHz, each with 32 K word private, 0 wait state
SRAM |
HOST INTERFACE: |
| Bus compatibility |
EEE P996 ISA compatible (IBM PC AT) |
| Bus speed |
12.5 MHz maximum |
| Bus mode |
Automatically configures to 8- or 16-bit transfer mode |
| Shared memory |
32 Kbyte page |
| Base addresses |
All LSI/xxxSC boards share the same base address. Shared memory is page
mapped in/out dynamically as needed. |
| Interrupt level |
IRQ 2/9, 3, 4, 5, 6, 7, 10, 11, 12, 14, 15, software selectable. One IRQ
line must be shared by all LSI/xxxSC boards. |
| I/O ports |
None |
TELEPHONE INTERFACE**: |
| Trunk type |
Loop start; also works with ground start for inbound applications |
| Impedance |
600 Ohms nominal |
| Loop current range |
20 to 120 mA |
| Ring detection |
40 to 130 Vrms, 15.3 to 68.0 Hz |
| Echo return loss |
20 dB min. |
| SNR |
-40 dB |
| Cross talk coupling |
-70 dB |
| Freq. response |
300 to 3400 Hz ±3 dB |
| Connector |
DB-37 |
POWER REQUIREMENTS: |
| +5 VDC |
3.0 A max. |
| +12 VDC |
250 mA max. |
| -12 VDC |
125 mA max. |
| Operating temperature |
0 C to +50 C |
| Storage temperature |
-20 C to +70 C |
| Humidity |
8% to 80% noncondensing |
| Form factor |
PC AT, 13.3 in. long. 0.793 in. wide (total envelope), 4.5 in. high (excluding
edge connector) |
SAFETY & EMI CERTIFICATIONS: |
| United States |
UL: 1459 |
| Canada |
CSA: 225 (by UL) |
| Estimated MTBF |
200,000 Hours per Bellcore Method I |
| Warranty |
3 years standard |
SPRINGWARE TECHNICAL SPECIFICATIONS* |
AUDIO SIGNAL: |
| Receive range |
-55 to +2.5 dBm nominal, configurable by parameter** |
| Silence detection |
-38 dBm nominal, software adjustable** |
| Transmit level |
(weighted average) -9 dBm nominal, configurable by parameter** |
|
DTMF TONE DETECTION: |
| DTMF digits |
0 to 9, *, #, A, B, C, D per Bellcore LSSGR Sec 6 |
| Dynamic range |
-36 dBm to +3 dBm per tone, configurable by parameter** |
| Minimum tone duration |
32 ms, can be increased with software configuration |
| Interdigit timing |
Detects like digits with a >45 ms interdigit delay. |
|
Detects different digits with a 0 ms interdigit delay. |
| Acceptable twist and |
frequency variation Meets Bellcore LSSGR Sec 6 and EIA 464 requirements |
| Noise tolerance |
Meets Bellcore LSSGR Sec 6 and EIA 464 requirements for Gaussian, impulse,
and power line noise tolerance |
| Talk off |
Detects less than 20 digits while monitoring Bellcore TR-TSY-000763 standard
speech tapes (LSSGR requirements specify detecting no more than 470 total
digits). Detects 0 digits while monitoring MITEL speech tape #CM 7291. |
GLOBAL TONE DETECTION(tm): |
| Tone type |
Programmable for single or dual |
| Max. number of tones |
Application dependent |
| Frequency range |
Programmable within 300 to 3500 Hz |
| Max. frequency deviation |
Programmable in 5 Hz increments. |
| Frequency resolution |
Less than 5 Hz. Note: Certain limitations exist for dual tones closer than
125 Hz apart. |
| Timing |
Programmable cadence qualifier, in 10 ms increments |
| Dynamic range |
Programmable, default set at -36 dBm to +3 dBm per tone |
GLOBAL TONE GENERATION(tm): |
| Tone type |
Generate single or dual tones |
| Frequency range |
Programmable within 200 to 4000 Hz |
| Frequency resolution |
1 Hz |
| Duration |
10 msec increments |
| Amplitude |
-43 dBm to -3 dBm per tone nominal, programmable |
MF SIGNALING: R1 |
| MF digits |
0 to 9, KP, ST, ST1, ST2, ST3 per Bellcore LSSGR Sec 6, TR-NWT-000506 and
CCITT Q.321 |
| Transmit level |
Complies with Bellcore LSSGR Sec 6, TR-NWT-000506 |
| Signaling mechanism |
Complies with Bellcore LSSGR Sec 6, TR-NWT-000506 |
| Dynamic range for detection |
-25 dBm to +3 dBm per tone |
| Acceptable twist |
6 dB |
| Acceptable freq. variation |
Less than ±1 Hz |
CALL PROGRESS ANALYSIS: |
| Busy tone detection |
Default setting designed to detect 74 out of 76 unique busy/congestion tones
used in 97 countries as specified by CCITT Rec. E., Suppl. #2. Default uses
both frequency and cadence detection. Application can select frequency only
for faster detection in specific environments. |
| Ring back detection |
Default setting designed to detect 83 out of 87 unique ring back tones used
in 96 countries as specified by CCITT Rec. E., Suppl. #2. Uses both frequency
and cadence detection. |
| Positive Voice |
Detection(tm) accuracy >99% based on tests on a database of real world
calls |
| Positive Voice Detection speed |
Detects voice in as little as 1/10th of a second |
| Positive Answering |
Machine Detection(tm) accuracy >89% based on tests on a database of real
world calls |
| Fax/modem detection |
Pre- programmed |
| Intercept detection |
Detects entire sequence of the North American tri-tone.
Other intercept tone sequences can be programmed. |
| Dial tone detection |
before dialing Application enable/disable; supports up to three different
user definable dial tones; programmable dial tone drop out debouncing. |
TONE DIALING: |
| DTMF digits |
0 to 9, *, #, A, B, C, D per Bellcore LSSGR Sec 6
TR-NWT-000506 |
| Frequency variation |
Less than ±1 Hz |
| Rate |
10 digits/s, configurable by parameter** |
| Level |
-4.0 dBm per tone, nominal, configurable by parameter** |
PULSE DIALING: |
| 10 digits |
0 to 9 |
| Pulsing rate |
10 pulses/s, nominal, configurable by parameter** |
| Break ratio |
60% nominal, configurable by parameter** |
* All specifications are subject to change without notice.
** Configurable to meet country-specific PTT requirements. Actual specification
may vary from country to country for approved products.
Hardware System Requirements:
80386, 80486, or Pentium IBM PC AT (ISA) bus or compatible computer.
Operating system hardware requirements vary according to the number of channels
being used.
Additional Components:
- Multidrop SCbus cable
- Optional: DB-37 to RJ-21X 50-pin cable; RJ-21X to RJ-11 Breakout Box
Station Adapter
See also: D/160SC-LS 16-Port Voice Processing and Analog Interface
Board |
