7 ANALOG VOICE I/O CARD
3021M100-002
7-3
7.2 Speeds Supported by the Analog Voice I/O Card
The card supports transmission rates of 5.8 Kbps or 8 Kbps using Algebraic Code-
Excited Linear Prediction II (ACELP II) and 40, 32, 24, or 16 Kbps (G.726), or 64
Kbps (G.711) on the system bus.
7.3 Line Interface Drivers
A line interface driver (LID) is a daughterboard which is mounted in connectors
J1, J3 and J5 on the Analog Voice I/O Card. The LIDs provide the interface
configuration for transformerless telephone connections (FXO and FXS only) and
control the signaling on the channel. Each Analog Voice I/O Card and its
associated port requires a LID.
LIDs are of five types: E&M 2-wire, E&M 4-wire, E&M 2/4-wire, FXO, and
FXS.
7.3.1 E&M Drivers
The E&M drivers provide connections to telephone equipment such as a PBX
using either a two-wire or four-wire voice connection. They can be configured to
comply with E&M types I, II, III, IV and V standards. The following paragraphs
describe the three types of E&M driver that are available. The LIDs support an
RJ-12 and a PB-45 port connector.
Figure 7-2 Analog Voice I/O Connector Plat
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