Also available in the 4-wire mode is selectable normal or reversed simplex signaling. In both 2-wire and 4-wire interfaces,provisionable wide-range gain/attenuation settings are provided. For ETO mode, both sourcing or sinking sealing current options are available when sealing current is required. The SS 2/4 card is not software upgradeable.
For all signaling modes, the Tellabs 1000 MSAP SS 2/4 plug-in card supports full equalization for 2-wire interfaces and built-in precision balancing with each equalization setting for echo cancellation over any loop. For 4-wire interfaces, post-equalization (transmit direction only) is provided. These equalization settings are available via provisionable selections for different cable configurations. Passive mismatch equalization is also available in the 4-wire mode, via selectable 150 ohm/600 ohm settings, for both transmit and receive directions.
Connecting POTS telephones to a computer telephony system via T-1 links requires a channel bank configured with FX-type connections. Generating a call from the POTS set to the computer telephony system requires a configured FXO connection. Generating a call from the computer telephony system to the POTS set requires a configured FXS connection.
FXO or FXS service can be ordered from telcom service providers outside the subscriber’s exchange area. With this service, a user can pick up a phone in one city and receive a dial tone and a local number from a “foreign” city. FX trunks provide the connection. Analog or T-1 links transport the signal.
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