M I N I A T U R E F I B E R O P T I C M O D E M S
FOM-9
Sync/Async High Speed Fiber Optic Modem
•Selectable sync or async operation
•Selectable data rates from 9.6 kbps to 128 kbps
•Range up to 15 km (9 miles) over single mode fiber
•Built-in BER tester and V.54 diagnostic loop support
•Carrier control mode for end-to-end signaling
•LED indicators for status display
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128 kbps | Fiber optic | 128 kbps |
| cable | |
| 15 km | |
FOM-9 | (9 miles) | FOM-9 |
The FOM-9 is a miniature sync/async fiber optic modem operating full or half duplex over fiber optic cable. It has a range of
15 km (9 miles) over single mode fiber and operates at selectable data rates up to 128 kbps.
The FOM-9 includes a built-in BER tester that generates a 511-bit pattern and can be used for testing the link integrity. Diagnostic loopbacks according to ITU V.54 can be activated for fault isolation. Two types of diagnostic loops are supported: local analog loop and remote digital loop. The loopback options and the BER tester can be activated by toggling pin 18 or 21 on the V.24/RS-232 interface.
When set to asynchronous mode, the modem internally converts the transmission to synchronous format, in compliance with the ITU V.14 standard.
The FOM-9 includes innovative circuits that allow operation without external power, by drawing low power from the DTE data and control signals. In cases where the DTE cannot provide enough power, the FOM-9 includes a special jack that can be connected to an external AC power supply adapter.
The modem has six LED indicators to display the status of the modem: TD, RD, DCD, RTS, TEST, and ERR.
FOM-8H
High Speed Fiber Optic Modem
•Sync or async transmission at 56 kbps or 64 kbps
•V.54 diagnostics
•Range up to 4 km (2.5 miles) over multimode fiber
•Controlled or continuous carrier
•V.24/RS-232, V.35, RS-530, or X.21 interface
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| Fiber optic cable |
| 56 or 64 kbps |
IBM 37X5 FOM-8H | FOM-8HIBM 3174 |
The FOM-8H is a high speed fiber optic modem operating full or half duplex over fiber optic cable. It has a range of 4 km (2.5 miles) at data rates up to 56 kbps or 64 kbps.
The FOM-8H has diagnostic capabilities complying with the ITU V.54 standard. Two loops are available: local analog loop and remote digital loop. These are activated by a manual switch or by toggling the corresponding pins of the DTE interface (not applicable with X.21 interface).
Transmit timing is provided by one of three alternative sources:
•internal oscillator
•loopback clock derived from the receive signal
•external clock from the terminal
The carrier can be strapped for either continuous or switched operation, controlled by the RTS signal.
Several interface options are available: RS-232/V.24, RS-530, X.21, or V.35. The modem has LED indicators for TD, DCD, TEST, and POWER. The FOM-8H is packaged in a lightweight plastic case.
152 RAD Data Communications 2006 Catalog
