Product Description
Memotec Inc. 4-17
4.10.3 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), ISDN-BRI S/T
(dual port, SDM-9220/9230 only)
• Dual serial port (WAN) interface card (SDM-9220/9230 only).
Analog Voice Interfaces
Four analog voice interface cards are available: FXS (dual or quad port), FXO (dual or
quad port), Universal E&M/PTT (quad port).
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 tele-
phone (pulse dial or DTMF touchtone)
• 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, or
3 in the SDM-9230, providing up to 12 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.
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