Product Description
Memotec Inc. 4-29
4.12.5 Types of Interface Cards
There are three types of interface cards:
• Analog voice interface cards: FXS (dual or quad port), FXO (dual or quad port),
E&M/PTT (quad port)
• Channelized digital interface cards: T1/E1 (single or dual port)
• Serial port (WAN) interface card (dual for the SDM-9220/9230 or single for the
SDM-9140)
Analog Voice Interfaces
Three types of analog voice interface cards are available:
•FXS (dual or quad port). See “FXS Interface Cards” on page 4-29.
•FXO (dual or quad port). See “FXO Interface Cards” on page 4-31.
• Universal E&M/PTT (quad port). See “Universal E&M/PTT Interface Card” on
page 4-32.
FXS Interface
Cards
• A Telco/PTT interface that acts like a PSTN Central Office.
• Provides a Subscriber Line connection to a conventional two-wire analog
telephone (pulse dial or DTMF touch-tone).
• Generates loop current and ring voltage (derived from -48V) as well as pulse dial
or DTMF tones.
• Detects off-hook and on-hook states.
• Dual port interface with 2 RJ-11 female connectors for the dual FXS interface
card.
• Quad port interface with 4 RJ-11 female connectors for the quad FXS interface
card.
• Equipped with an onboard DSP processor.
• Up to 2 FXS interface cards can be installed in the SDM-9120 and SDM-9220, up
to 3 in the SDM-9230, and up to 4 in the SDM-9140, providing up to 16 analog
FXS voice ports in a single unit.
Ordering part numbers for SDM-9120:
161-1350-000 for the dual FXS interface card
161-1326-000 for the quad FXS interface card.
Ordering part numbers for SDM-9220/9230:
161-1050-000 for the dual FXS interface card
161-1026-000 for the quad FXS interface card.
Ordering part numbers for SDM-9140:
161-1450-000 for the dual FXS interface card
161-1426-000 for the quad FXS interface card.
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