Comtech EF Data SMS-301 Manuel utilisateur

Modem

ccessories

SMS-301 Modem

Protection Switch

2114 West 7th Street, Tempe,Arizona 85281 USA Voice 1 480 333 2200 Fax 1 480 333 2540 Email sales@comtechefdata.com

Comtech EF Data reserves the right to change specifications of products described in this document at any time withoutnotice and withoutobligation to notify any person of such changes. Information in this

document may differ from that published in other Comtech EF Data documents. Referto the website or contact Customer Service for the latest releasedproduct information.

FEATURES

• Full feature monitor and control processor

• Remote input for configuration and status

• 1:1 configuration

• One rack unit (1RU) chassis

APPLICATIONS

The SMS-301 is a fully programmable 1:1 protection

switch providing complete redundancy for one prime and

one backup modem. The SMS-301 switch is designed to

operate with Comtech EF Data satellite modems and is

a direct replacement for the SMS-651B 70/140 MHz

Switch.

Programming the SMS-301 is accomplished through the

front panel keyboard or the remote interface. Complete

functionality control and monitoring of switch status and

faults are easily accessed through the remote port

connection.

The SMS-301 simultaneously switches data and IF

paths, either independently or dependently. The

switching type is selectable through the front panel or

remote port, eliminating the need for firmware changes

and allowing maximum in-use flexibility.

When a fault is detected in the online modulator or

demodulator, a switch to the offline modem occurs if the

backup is not in a faulted condition. The transmit data is

sent to the backup modem by the 1:1 switch to prevent

false indications of transmit faults. The actual switching

can be accomplished in under 20 milliseconds, with

programmable modulator and demodulator switching

delays in the range of 0 to 127 seconds.

The front panel LEDs indicate which modulator and

demodulator (prime or backup) are online. The LEDs

also indicate the following:

• Active faults in the modulator or demodulator

• Status of the SMS-301’s redundant power supplies

• Mode of the switch (automatic or manual)

OTHER FEATURES

• Uses standard Comtech EF Data modem as backup

or prime

• Dependent or independent modulator and

demodulator switching

• Local/remote, automatic/manual control

• Redundant power supplies and AC inputs

• Easy installation

SIGNALS MONITORED

• Operation mode: Automatic or manual

• Switching mode: Independent or dependent

mod/demod

• Modulator/Demodulator online delay

• Modem online: A or B (dependent mode)

• Modulator/Demodulator online: A or B (independent

mode)

• Remote configuration (local only): EIA-232 or EIA-

485, address, baud, parity, bits per word

• Remote mode (switch)

• Clear stored faults

• Current faults

• Stored faults

• Switch status

• Equipment type

• Store/recall multiple switch configurations

• Remote access to modulator/demodulator status

• Modem configuration copy to opposite modem

Optimizing Satellite Communications

www.comtechefdata.co

SMS-301 Modem Protection Switch

SPECIFICATIONS

System

Data Interface EIA-232, V.35, EIA-422, G.703, and MIL-STD-188-114

Data Rate 20 Mbps max.

IF Interface impedance 75ΩBNC (50 Ωoptional)

IF Frequency 50 to 180 MHz

Operation Modes Auto/manual, local/remote

Power 90 to 264 VAC, 47 to 63 Hz, 30W max.

Size 19 inch W x 15.2 inchD x 1.75 inch H (1RU) (48.2 x 38.6 x 4.4 cm)

Weight 9 lbs. (4.0 kg) max.

Controls

Switch Remote/local

Modulator A/B online select or auto

Demodulator A/B online select or auto

Indicators

Power Supplies 1, 2 on

Mode Automatic or manual

Modulator A/B online

Demodulator A/B online

Faults Transmit, receive, system, and stored

M&C

Remote Monitor and Control 9-pin D sub connector, EIA-232 or EIA-485 (2- or 4-wire), front panel selectable

Monitor and Control

Serial Interface EIA-232 or EIA-485, programmable

Baud Rate 150 to 19200 bit/s, programmable

Parameters Controlled Start/stop, parity, data bits

SMS-301 BLOCK DIAGRAM

SWITCH M&C

LOGIC

MODEM A

MODEM B

TRANSMIT IF

RECEIVE IF

BASEBAND DATA

TX/RX

BASEBAND DATA

TX/RX

MODEM REMOTE

EIA-485

J13

J14 STATUS/FAULTS

REMOTE

CONTROL

J3 J6 J7

J10

J9J5J2

SPLITTER

BASEBAND DATA I/O

TO/FROM CUSTOMER

RECEIVE IF

50 TO 180 MHZ

FROM

DOWN CONVERTER

TRANSMIT IF

50 TO 180 MHZ

TO UP CONVERTER

EIA-232 OR EIA-485

HOST TERMINAL

OR COMPUTER

1:1SWITCH

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