Black Box RS-232 Specifications, Typical Application, Package Includes, Ordering Information

Typical Application

	Dedicated	Dedicated
		Line
	Modem (A)
	RS-232
	Fallback
	Switch	Dialup
Server	Dialup
		Circuit
	Modem (B)

procedure includes:

•Running cable from your primary modem (or other device) to the rear-panel PRIMARY connector.

•Running cable from your alternate modem (or other device) to the rear-panel ALTERNATE connector.

•Running cable from the master or common device (server, PC, host, printer, etc.) to the rear-panel MASTER connector.

•Attaching the switch’s power cord.

The RS-232 Fallback Switch begins operating when it receives power. The type of switching, whether it’s automatic or manual, is determined by the position of the front-panel toggle switch. LEDs light up to show whether it’s switched (automatically or manually) to the primary device, or if it’s switched to the alternate device.

Specifications

Compliance: FCC Part 15, Class A; DOC Class/MDC classe A; CE

Compatibility: Compatible with dialup modems using ITU-TSS V.34, V.32 bis, V.32, and most other major modem standards

Data Format: Transparent to data format

Data Rate: Up to maximum rate supported by cabling

Distance (Maximum): 50 ft. (15.2 m) to any attached RS-232 device using standard cables

Interfaces: EIA RS-232C, modular telco

Connectors: (3) rear-mounted DB25 F: Common (master), primary, and alternate ports

Indicators: (2) front-mounted LEDs showing active channel (ALT/PRI)

Temperature Tolerance: Operating: 32 to 122˚F (0 to 50˚C);

Storage: -4 to +158˚F (-20 to +70˚C)

Humidity Tolerance: Up to 95% noncondensing

NOTE: For all DCE connections to the the PRIMARY and ALTERNATE connectors, use straight-through pinned RS-232 cable. For DTE connections to the same ports, you’ll need specially cross-pinned cable (for details, call Black Box Tech Support). For DTE connections to the MASTER connector, use straight-through-pinned RS-232 cable. To attach a DCE device to the MASTER port, use specially cross-pinned cable (for details, call Black Box Tech Support).

Package Includes

Flow Control: Transparent to flow control, but monitors/ switches on DSR, CTS, or RLSD (DCD); also passes or forces DTR

Leads/Signals Supported:

2 through 6, 8, 15, 17, 20 through 22, and 24 (TD, RD, RTS, CTS, DSR, RLSD [CD], TSETC [TC], RSETC [RC], DTR, RI, and TSETT [EXTC] respectively); 1 and 7 (PGND and SGND respectively) are tied common

User Controls: (1) front-mounted toggle switch for selecting automatic/ primary/alternate;

(4) internal configuration jumpers

MTBF: 180,000 hours

Enclosure: High-impact ABS plastic

Power: SW901A: 115 VAC, 60 Hz, through detachable power cord (included) and internal power supply;

SW901AE 230 VAC, 50 Hz, through detachable power cord (not included) and internal power supply;

Consumption (both models): 8 watts

Size: 2.5"H x 8"W X 12"D (6.4 x 20.3 x 30.5 cm)

Weight: 2.7 lb. (1.2 kg)

•The RS-232 Fallback Switch

•Detachable power cord

•Users’ manual

Ordering Information

ITEM	CODE
RS-232 Fallback Switch
115-VAC	SW901A
230-VAC	SW901AE

You may also need…

RS-232 Cable, 25 Conductors (121⁄2 Pairs)—Pins 1–25

(Specify gender and length) ................................ECM25C

2