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Bell 201 modem
UDS 201 BC/AS
Reliable 2,400bps transmission over bad lines compatible with
201B and 201C (DPSK) Synchronous Asynchronous modems. Multi-Point
/ Multi-Drop, Dial, 2 or 4 wire lease line.
UDS
201 SERIES 2400 bps modem
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UDS
201 SERIES 2400 bps modem
UDS 201 series modems operate at 2400 bps and are Bell compatible.
Internal diagnostic features allow the user to isolate communications
faults to the modem, telephone line or data terminal equipment.
PRODUCT HIGHLIGHTS
* 201BC/AS Operates over 2-wire dial-up or 4-wire
leased lines; Provides synchronous or asynchronous operation
* 201C/D Includes serial synchronous auto dialer which utilizes bisync
protocol for DTE dialing
* 2140 Multi-protocol dialer/modem providing 2400 bps operation
compliant with CCITT V.26 bis and Bell 201C; Auto dialing capabilities
include V.25 bis, bisync, and SDLC, as well as 801 mode; Handles
numbers up to 36 digits long - tone or pulse dial type; Options may be
added via straps and switches, or can be software selected
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The 201 BC/AS
is a 2400 bps per second modem designed far Synchronous
or Asynchronous
data communications. The unit combines two modem types;
201B for
leased line operation - 2 or 4 wire
201C for operation of the Pubic Switched Telephone Network (PSTN)
This combination and the addition of local and remote diagnostic tests provide
flexibility in designing communication networks using any synchronous or
asynchronous data protocol at 2400 bps, The 20IBC/AS is available in either a
115 VAC or a 230 VAC powered version. When used as a 201A in leased line
operation. data is transferred in half-duplex mode on 2-Wire and in full-duplex
mode on 4 wire lines. Switched line operation in 201C mode is always
half-duplex.
Numerous options
are provided so the 201BC/AS may be tailored to your particular application.
These options are set by straps and switches on the modem printed circuit board
Control of local and remote diagnostic tests is provided by a rotary switch on
the front panel. Modem operations monitored by observing the nine LED indicators
on the front panel. The printed circuit board containing the 20IBC/AS also fits
in the UDS RM-16 shelf.
Specifications
| Data Rate: |
2400 bits
per second synchronous |
| Character
Format: |
Synchronous.
or 8,9,10, of I I bit asynchronous |
| Communications
Mode: |
Over PSTN
2-wire, half-duplex over Leased Lines; 2-wire, half-duplex, at 4-wire,
full duplex |
| Modulation: |
Differentially
Phase Shift Keyed (DPSK) |
| Carrier
Frequency: |
1800 Hz±0.01% |
| Receiver
Sensitivity: |
-45 dBm or
-30 dBrm selectable |
| Telephone
Line Interface: |
600 ohms
transformer coupled, transient protected |
| Line
Connection: |
Over PSTN:
Permissive or programmable
Over Leased Lines; Transmit levels selectable for 0 to -12 d8m |
| Line
Conditioning: |
Telephone
line conditioning is not required |
| Digital
Interface: |
EIA RS-232C
and CCITT V.24 |
| Automatic
Answer: |
Over PSTN:
optional automatic or manual answering |
| Originate: |
Over PSTN:
manual using exclusion key telephone |
| Dimensions: |
7"W x
2.25"H x 9.60"D: Weight is approximately 2 lb, 9 oz. |
| Temperature: |
Operating: 0
to +50C Storage. -40 to +85C |
| Humidity: |
96%
relative, non-condensing |
| Power
Requirements: |
115Vac±10%;
50/60 Hz or 230Vac±10%
50/60 Hz for applicable models.
47 to 63hz
10 Watts maximum |
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