Manuals / Black Box / Computer Equipment / Modem

Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual 8 V.33 and Bell 208A/B Options

Models: MD885C-R2 MD885A-R3 MD885AE-R2 34336

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3.0 Modem Setup Options

The Speaker Volume option is available for all modes. It can be set to LOW, MEDIUM, or HIGH.

The Guard Tones option is available for Hayes, V.25 bis, Dumb modes. Guard tones are used in V.22 and V.22 bis modes only, to assure proper band separation on systems that use international telephone circuits. Unless you are using international circuits in one of these modes, you should turn the guard-tone option OFF. If guard tones are required, their frequency can be set to 550 Hz or 1800 Hz (the most commonly used guard-tone frequency).

V.13 Operation is available for V.25 bis, Dumb, and Leased modes (synchronous operation only).

•OFF — V.13 operation is off. This setting allows normal full duplex operation. (All other selections are for enabling V.13 operation.)

•TX ONLY — Status of RTS will be sent to remote modem.

•RX ONLY — Carrier Detect (CD) will be controlled by V.13 signals from the remote modem.

•TX AND RX — Status of RTS will be sent to remote modem, and CD will be controlled by V.13 signals from the remote modem.

To select one of the four V.13 options, press pushbutton 1 or 3 with the V13 screen displayed until the selection you want is displayed. For half-duplex point-to-point applications, select TX AND RX. For multidrop applications, select RX ONLY for all modems at the host site and TX ONLY for all modems at the remote site. For further information on V.13 operation, see Section 4.10.

3.3.8 V.33 AND BELL 208A/B OPTIONS

The following three options are available on the Modem only and are intended only for V.33 or Bell 208A/B operation. (For Bell 208 operation, see also the Satellite Delay and Turnaround Delay options.)

The Carrier Type option is available for V.25 bis, Dumb, Leased line modes.

•SWITCHED (SWITCH) — For 2-wire applications, the carrier type option must be set for switched carrier operation.

•CONSTANT — Constant or continuous carrier can only be used for 4-wire leased-line applications (although such applications may also use switched carrier).

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Black Box MD885A-R3, MD885AE-R2, MD885C-R2, 34336 user manual 8 V.33 and Bell 208A/B Options
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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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