5

Technical Specifications

Number of ports

Four

Max. boards/system

16

Analog network interface

Onboard loop start interface circuits

Microprocessor

80C188

Digital signal processor

Motorola* DSP56001

Host Interface

Bus compatibility

IBM PC XT/AT (ISA)

Bus speed

4 MHz to 12 MHz, 70 nsec back-to-back bus cycle

Shared memory

8 KB page, switch selectable on 8 KB boundaries

Base addresses

D000h (default)

A000h

C000h

Interrupt level

IRQ 2 to IRQ 7 jumper selectable

One IRQ is shared by all DIALOG/4 boards

Trunk type

Loop start (or ground start for answer only)

Impedance

600 Ohms nominal

Ring detection

25 Vrms minimum

15.3 Hz to 68 Hz, 150 Vrms maximum

Loop current range

20 mA to 120 mA, DC (polarity insensitive)

Receive signal/noise ratio

70 dB, referenced to –15 dBm

Crosstalk coupling

–70 dB at 1 kHz channel to channel

Frequency response

300 Hz to 3400 Hz ±3 dB (transmit and receive)

Connector

Two RJ-11 type

Power Requirements

+5 VDC

.75 A

+12 VDC

40 mA

–12 VDC

40 mA

Operating temperature

0°C to +50°C

Storage temperature

–20°C to +70°C

Humidity

8% to 80% noncondensing

Form factor

PC XT (ISA)

7 in. long (17.5 cm)

0.652 in. wide (1.63 cm)

4.5 in. high (11.25 cm) (excluding edge connector)

Safety and EMI Certifications

United States

FCC part 68 ID#: EBZUSA-65588-VM-E

UL: E143032

Canada

DOC: 885-4452A

ULC: E143032

Estimated MTBF

309,000 hours per Bellcore Method I

Warranty

http://www.intel.com/network/csp/products/3144web.htm

Datasheet