Section 1, System Description ATLAS 550 System Manual
20 © 2002 ADTRAN, Inc. 61200305L1-1F
Octal/Quad FXS Option Module (P/N 1200309L1/1200328L1)
The Octal/Quad FXS Option Modules provide eight or four analog voice-grade interfaces. Each interface
provides talk battery, off-hook supervision, E&M signaling conversion, and ringing in loop-start or
ground-start operation. Call progress tones, where necessary, are provided to the modules by the
ATLAS 550 base unit.
Octal/Quad FXO Option Module (P/N 1200310L1/1200329L1)
The Octal/Quad FXO Option Modules provide eight or four analog voice-grade interfaces. Each interface
supports loop-start and ground-start operation. Applications include termination of analog PSTN trunks
and connections to PBX station-side interfaces (OPX).
Octal E&M Option Module (P/N 1200313L1)
The Octal E&M Option Module provides eight analog voice-grade interfaces, either 2-wire or 4-wire, for
use as tie-trunks, using E&M signaling or as dedicated transmission only (TO) interfaces for additional
data services. E&M signaling types 1-5 are supported.
Legacy Data Option Module (P/N 1200342L1)
The Legacy Data Option Module provides four EIA-232 or V.35 interfaces (or any combination up to four)
for sync or async packet data applications. Protocols supported include SNA/SDLC, frame relay, PPP,
transparent bit-oriented (TBOP), and transparent async. The Legacy Data Option Module includes an
adapter cable to provide four EIA-232 (DB-25) interfaces. An optional V.35 adapter cable
(P/N 1200348L1) is also available.
NxT1 HSSI/V.35 Option Module (P/N 1200346L2)
The NxT1 HSSI/V.35 Option Module aggregates bandwidth of up to eight T1s into a single logical channel
on the HSSI or V.35 (using an optional adapter cable) interface. The NxT1 HSSI/V.35 Option Module
supports point-to-point T1 applications only. Any of the four built-in T1 ports of the NxT1 HSSI/V.35
Option Module can provide timing for the ATLAS 550 system.
Octal Ethernet Switch Option Module (P/N 1200766L1)
The Octal Ethernet Switch Option Module provides eight interfaces that can operate as 10BaseT or
100BaseTX. Each interface uses auto-negotiation to support Ethernet traffic at 10 Mbps or 100 Mbps,
half-duplex or full-duplex. Automatic MDI/MDIX crossover is provided to simplify LAN connections.
Resource Host Module (P/N 1200324L1)
The Resource Host Module provides an inexpensive way to use a desired plug-on resource module, such as
the Voice Compression Module, when a plug-in module is not necessary. This module has no other
functionality except to act as the base for the plug-on resource modules.