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.
201 SERIES 2400 bps modem
* 201BC/AS Operates over 2-wire dial-up or 4-wire
leased lines; Provides synchronous or asynchronous operation
The 201 BC/AS is a 2400 bps per second modem designed far Synchronous or Asynchronous data communications. The unit combines two modem types;
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.
|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|
50/60 Hz or 230Vac±10%
50/60 Hz for applicable models.
47 to 63hz
10 Watts maximum