RACAL VADIC
202T 202S 202ST

Bell, 202T 202S, 202S/T,
115 and 220 VAC and 12, 24, 48 Volt DC power Modems -
and a 801 Auto Calling for the 202S/T modem


The Racal Vadic VA1251 202T Modem AC DC powered

  • Asynchronous, full or half duplex, 1200 and 1800 bps

  • Bell 202T modem
    (202S see VA1250-PX), 202D, and 202R compatible

  • 2 or 4-wire full-half-duplex leased-line operation

  • Complete diagnostics

Low-Cost, 1800 bps

Leased-Line Modem

Two Applications in One Modem

The VA1251 is a 0 to 1800 bps, full-duplex modem designed for 4-wire leased lines and 2-wire half-duplex applications, as well as multidrop and point-to-point environments. The modem is strapped for 4-wire operation, but is easily converted to 2-wire operation in a few minutes. The VA1251 is compatible with the Bell 202 family, but does not support reverse channel operation. Multi-drop operation is available when optioned in 2-wire or 4-wire configurations.

High Reliability and Longevity

The VA1251 utilizes modem digital and analog technology to achieve the highest performance and reliability. With low power CMOS components, automated manufacturing techniques, and computer-controlled testing, you are assured a quality modem with long-term stability. The VA1251 comes in high-quality, low-profile housing designed to complement any office environment.

Versatile Options

The VA1251 incorporates application knowledge gained by Racal-Vadic. This knowledge, in the form of switchable options, is easy to use. A variety of options in the VA1251 allows you to maximize system operation throughput without loss in performance. For example, a special high impedance option eliminates the need for expensive bridges in Multidrop systems. In addition, you can quickly change the functional operation of the VA1251 with the flip of a switch, allowing the modem to change along with your systems and terminals.

 Complete Diagnostics

The VA1251's extensive interface display, coupled with the local analog loopback, remote digital loopback, and forced Request To Send (RTS) features, make it easy to isolate a problem.


VA1251 202T Modem Specifications

 

Compatibility
B
ell 202T, 202D, and 202R

Operating Speeds
0 to 1800 bps

Operation
Half-duplex 2-wire or full-duplex 4-wire leased-line connection; point-to-point or multidrop

Data Format
Serial, binary, and asynchronous

DTE Interface
A 25-pin female connector on the modem's rear panel provides an EIA RS-232-D connection to the data terminal equipment (DTE)

Line Equalization
Fixed compromise

Transmit Level
0 to -15 dBm I dB selectable in IdB steps

Receiver Sensitivity
0 to -35 dBm

Carrier Detect Threshold
Off. -39 dBm
On: -33 dBm

Hysteresis: 2 dB minimum

Front Panel
LEDs: TXD, RXD, RTS, CTS, DSR, CXR

Diagnostics
Analog loopback, Remote digital loopback, Transmit
Reversals, (TXR) Forced Request To Send (RTS)

Dimensions
Height: 2.5 in (6-5 cm)
Width: 7 in (17.8 cm)
Length: 12 in (30.5 cm)
Weight: 2.2 lb (1.0 kg) excluding power supply

Power Requirements
115 V AC 10%, 60 3 Hz, 10 W maximum

DC Power Requirements

12V, 24V, 48V, DC power, 10 W maximum


The VA1250 Modem 202S dial modem

  • Asynchronous, half duplex, 1200 bps
  • Bell 202S, 202C, and 202E compatible
  • Connects to 2-wire dial-up or leased lines
  • Built-in voice/data/manual switch
  • Complete diagnostics

Direct-Connect, 1200 bps Half-Duplex Modem

The VA1250 is a 0 to 1200 bps, half-duplex modem designed for dial-up applications or 2-wire leased-line connections.

Voice/Data/Manual Switch

The VA1250 has a voice/data/manual switch on its front panel so the modem can be operated in conjunction with a standard telephone set. This feature eliminates the need for a special exclusion key on the telephone and allows the operator to manually originate or answer a call, as well as use the telephone for normal conversation.

It's Compact, Easy to Install and Use

The VA1250 is as easy to use as an extension telephone. You just plug it in. The modem is approved by the FCC for direct connection to the telephone line and uses the RJ11C telephone jack, the same as a standard telephone. The VA1250 comes in high-quality, low-profile housing designed to complement any office environment.

Versatile Options

The VA1250 incorporates application knowledge gained by Racal-Vadic. This knowledge, in the form of switchable options, is easy to use. For example, half-duplex modems do not have the luxury of "carrier off' and "abort" disconnect options. However, the VA1250 incorporates a "Line Current Disconnect" option for unattended operation. The options available in this modem reduce the problem of early obsolescence.

Complete Diagnostics

The VA1250's extensive interface display, coupled with the local analog loopback and forced Request To Send (RTS) features, make it easy to isolate a problem.

Compatibility

Bell 202S, 202C, and 202E

Operating Speeds

0 to 1200 bps

Operation

Permissive half-duplex 2-wire dial-up (PSTN) or 2-wire leased-line connection

Data Format

Serial, binary, and asynchronous

DTE Interface

A 25-pin female connector on the modem's rear panel provides an EIA RS-232-D connection to the data terminal equipment (DTE)

Line Equalization

Fixed compromise

Transmit Level

Permissive: -10 dBm

Leased Line: 0 dBm

Receiver Sensitivity

Switched Network: -10 dBm to -45 dBrn

Leased Line: 0 to -45 dBm

Carrier Detect Threshold

Off: -51 dBm

On: -45 dBm

Hysteresis: 2 dB minimum

Front Panel

8 LEDs: TXD, RXI), RTS, CTS, DSR, DTR, R1, CXR Voice/data/manual switch

Diagnostics

Analog loopback/busy out

Forced Request To Send (RTS)

Transmit Reversals (T-XR)

Dimensions

Height: 2.55 in (6.5 cm)

Width: 7 in (17.8 cm)

Length: 12 in (30.5 cm)

Weight: 2.2 11) 0.0 kg) excluding power supply

Power Requirements

117 V AC 10%, 57 to 63 Hz, 10 W maximum

DC Power Requirements
12V, 24V, 48V, DC power, 10 W maximum

Operating Environment

Operating temperature: 32' to 122' F (0' to 50' C)

Storage Temperature: -4' to 158' F (-20' to 70' C)

Humidity: 5% to 90% noncondensing

FCC Part 68

Registration Number: AJ496M-62924-DM-N

Ringer Equivalence: LOB

UL Listed

Ordering Information

The 1250-PX includes a telephone cable with RJ11C connector for dial-up connection. The 1251-KX modems include a telephone cable with spade lug connectors for leased line connections. The 1244-PX includes a dial-up telephone cable with RJ11C connector—P/N 15027-004. For optional 12VDC, 24VDC or 48VDC power supply indicate after model number (ex. 1250-PX, 12VDC).

 

Models Description

1250-PX External Bell 202S modem

1251-KX External Bell 202T modem

1244-PX Rackmount Bell 202S/T modem

Options

15044-004 1244-PX 4-wire leased line cable

15022-004 1244-PX 2-wire leased line cable

1681C Sixteen slot chassis for 1244-PX

1604 Four slot chassis for 1244-PX

811 Bell 801 rack mount dialer (RS366)

831 Adapter RS366 to RS232


1600-Series Chassis' for Bell 202, 201 and 208 MODEMS

va1600.gif (38068 bytes)

Broad Line of Communications Products

The 1681C, 1680 and 1604 chassis handle a wide variety of dial-up network applications. The chassis accommodate Bell 202, 201 and 208 modems, full and half duplex, asynchronous and synchronous, dial-up and leased line. The chassis also accommodate the following accessory cards: the 811 single and multiline Bell 801 dialer and the 831 RS-232-D to RS-366 adapter.

Displays Simplify Installation and Troubleshooting

The 1681C, 1680 and 1604 offers front panel control of all equipment in the chassis. You can monitor channel traffic with status LEDs that warn you of malfunctions. EIA signals can be displayed for each modem. Front panel switches activate the modem's built-in diagnostics, allowing you to isolate and test local and remote modems, telephone lines, terminals and computer interfaces. Individual busyout and analog loopback switches enable you to take modems out of service for testing.
The 1681C occupies 10.5 inches of rack height. The 1681C is also self-cooling, so you can stack up to seven chassis in a standard 7-foot high cabinet. The 1680 occupies 7.0 inches of rack height and will stack up to ten chassis in a standard 7-foot high cabinet.

1604 Desktop Chassis

The 1604 is a 4 slot, self contained, standalone desktop unit for remote site applications. This chassis is ideal for organizations whose call traffic doesn't require a full complement of 16 modems, and is more efficient from a cost and operations standpoint than a configuration using multiple external modems.

Wide range of Modems and Accessories

The 1604 houses four single-slot modems, or two dual-slot modems, such as the 4840-PX or any combination of modems and accessory cards. All modems, auto-dialers and accessories that mount in the 1681C are also compatible with the 1604.

Front Panel Diagnostics

The user-friendly front panel has LEDs that display line, power, EIA interface and test status. Switches allow you to control channel select, test pattern generation and remote and local loopbacks. The 1604 also has a built-in power supply with a switch to select either 115 or 230 volt AC operation.

Specifications

1681C, 1680 and 1604 Chassis

Configuration 1681C: 16 slots for modems and accessory cards

1680: 16 slots for modems and accessory cards

1604: 4 slots for modems and accessory cards

Front Panel 16 channel status indicators (4 indicators for 1604)

8 EIA status indicators

Power supply status indicator

Power alarm indicator

16 busyout switches (1681C and 1680 only)

Analog loopback switches

Digital loopback switches

Transmit reversal switches

Channel select thumbwheel switch

Modems 4840-PX, 2440-PX and 1244-PX

Accessory Cards 811 —801 compatible, RS-366 automatic calling unit, 831—RS-366 to RS-232-D adapter for 811

Dimensions 1681C: Height: 10.5"; width: 19.0"; length: 15.0"; weight: 30 lbs.

1680: Height: 10.5"; width: 19.0"; length: 15.0"; weight: 19.25 lbs.

1604: Height: 4.81"; width: 9.0"; length: 15.0"; weight: 10.5 lbs.

Power Requirements 1681C: 110VAC—95 to 127VAC, 60Hz, 1.8 amps fully loaded

1680: 115/230VAC, 50/60Hz, 1.5 amps (fully loaded at 115VAC)

1604: 115/230VAC, 50/60Hz, 0.5 amps (fully loaded at 115VAC)

Power Dissipation 1681C: Forced air fan cooling

1680: Vertical convection cooling

1604: Forced air fan cooling

Temperature Operating: 32-122 F ambient; Store:-4-158F; Humidity:5-95%NC

Compliance FCC Part 68, Part 15_Class A, UL listed

Ordering Information

The 1681C chassis includes a removable 110VAC power supply P/N 94200-055. The 1680 chassis includes two removable 115/230VAC power supply P/N 94200-026. The 1604 chassis includes an integral 115/230VAC power supply.

Models Description

1681C 16 slot chassis

1680-AM2 16 slot chassis with dual power supplies

1604 4 slot desktop chassis

Options

94200-055 2085 power supply for 1681C chassis

94200-026 2082 power supply for 1680 chassis

Modems

4840-PX 4800 bps Bell 208A/B modem (Requires 2 slots)

2440-PX 2400 bps Bell 201B/C modems (1 slot)

1244-PX 1200 bps Bell 202S/T modem (1 slot)

Accessories

811 Bell 801 rackmount dialer (RS366)

831 Adapter RS366 to RS232



ARC ELECTRONICS
301-924-7400 EXT 25

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