Specifications

Configuring the Modem

You configure the modem using the three sets of DIP switches on the bottom of the modem.

IMPORTANT

It is important to follow the three steps described below, in the order shown, to ensure

that you configure your modem properly using the modem DIP switches:

1. Use DIP switch 3 (SW3) to configure the modem for your host DTE interface and

network topology. Using SW3, you select the modem to operate in high-speed fast-

poll or low-speed (FSK) mode.

2. If you set SW3 for FSK mode in step 1, use DIP switch 2 (SW2) to configure the

modem for either Bell 202T or ITU-T V.23 compatibility. Otherwise, you can use

the modem in fallback mode.

3. Use DIP switch 1 (SW1) to select the modem’s transmitter output level and receiver

dynamic range. The SW1 settings apply for both high-speed fast-poll and low-speed

(FSK) modes.

SW1 DIP Switch Settings

SW1 is an 8-position DIP switch. Table 2-1 shows the modem switch settings for DIP switch SW1. A description of

the SW1 switch settings follows the table.

Note:

SW1 settings apply for both high-speed fast-poll and low-speed (FSK) modes

Table 2-1. Modem Switch Settings for DIP Switch SW1

Switch Settings Switches

ON OFF (Default)

SW1-1 − 1-4: Transmit Level (page 10)

(see Table 2-2 on page 10)

SW1-5: Receiver Dynamic Range (page 10)

−10 to −43 dBm +3 to −30 dBm

SW1-6: TX Cable Equalizer (page 10) Enabled Disabled

SW1-7: RX Cable Equalizer (page 10) Enabled Disabled

SW1-8: Anti-streaming (page 11) Active Inactive

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