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Enterprise Integrated Access Device


ADTRAN Products
Integrated Access Device
ATLAS 550 Unit AC, with T1/PRI NIM, RoHS
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ATLAS 550 Unit DC
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ATLAS 550 System for T1-to-PRI Converter
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ATLAS 550 System for Video Switch
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The ADTRAN ATLAS™ 550 is a six-slot modular Integrated Access Device (IAD) designed to improve and lower the costs of voice/data, video, and Internet communications for enterprise businesses and network service providers. With the ATLAS 550, many WAN functions have now been combined into a small, economical, modular platform that will replace a rack of traditional single-function access devices. With the ATLAS 550, traditional multiplexed and packet networks are easier to deploy and manage while providing more bandwidth efficiency out of existing or new communications links. The ATLAS 550 provides a new level of communications flexibility by offering many of the features previously found in larger central office, PBX, or router equipment.

The ATLAS 550 chassis includes a highspeed multi-protocol backplane and six modular expansion slots: two network interface slots and four user interfaces slots. A wide range of hot-swappable, industrystandard modules are also available to effectively converge your telecommunications and your existing network systems, such as routers, PBX, key systems, video conferencing equipment, remote access servers, LANS, faxes, and telephones. The ATLAS 550 typically resides at the customer site and performs the functions found in multi-port multiplexers, channel banks, 1/0 cross connect switches, Frame Relay Access Devices/concentrators/ switches, IP routers, and ISDN switches. It also includes an integral voice switchboard and dial plan for dynamically and intelligently switching voice and data calls based on the telephone number dialed.

The ATLAS 550 supports multiple network technologies including T1/FT1, DSX-1, E1, ISDN, FXS, FXO, V.35 and 10/100Base-T Ethernet and is designed to be used for more cost-effective T1, ISDN or Frame Relay networks. With the modularity of ATLAS 550, users can now support up to 10 FT1s and run traditional switched or multiplexed voice/data traffic, ISDN, or packetized Frame Relay. Users can also run a hybrid mix of network architectures that will make it easier to evolve network systems and applications.

For configuration and troubleshooting, the ATLAS 550 includes LEDs for complete operational status indications, front and rear VT100 craft interfaces for terminal or dial-in access, alarm contacts, and a 10/100Base-T Ethernet LAN connection for SNMP and Telnet.


  • Supports TDM or packet networks
  • Six-slot modular chassis includes one T1/PRI or E1/PRA Network Interface Module (NIM), a second NIM option slot, and four user option slots
  • Supports FXS, FXO, E&M and DSX-1 for PBX or key systems
  • Provides integral DSU/ CSUs, multiplexing, 1/0 DACSing, Frame Relay, PPP, IP routing, ISDN switching, and intelligent voice/data call routing
  • Hot-swappable modules
  • Management includes: SNMP, Telnet, and VT100
  • Integral Frame Relay software for access, concentration, and switching
  • Integral 10/100Base-T Ethernet for Telnet access and IP routing using PPP or Frame Relay Encapsulation
  • Supports up to 32 analog ports
  • AC and DC powered versions
  • Industry-leading five-year North American warranty


Front View Front View

Rear View Rear View

ATLAS 550 Specifications
T1/PRI Network Interface module
  • One built-in T1/DSX-1/PRI port
  • Full or fractional T1 support
  • Connects with network or user equipment under software control
  • Built-in CSU
  • Signaling ISDN D Channel, Robbed-Bit: E&M, FXS, FXO, ground and loop start, DID conversion between T1 and ISDN
Line Rate 1.544 Mbps +/-75 bps
Physical Interface RJ-48C, modular 8-pin
Framing D4(SF)/ESF
Line Code AMI/B8ZS
Input Signal 0 to -36 dB
Line Length DS-1: 6,000 ft (24 AWG), DSX-1: 655 ft
LAN Features Built-in 10/100BaseT Ethernet port
IP Router Features RIP V1, RIP V2, ICMP, ARP, IARP, UDP Relay, OSPF
WAN Features
  • Frame Relay with RFC 1490 encapsulation
  • PPP
Link Management
  • ANSI T1.617-D (Annex D)
  • ITU-T Q.933-A (Annex A)
  • LMI (Group of four)
  • Automatic link management protocol discovery
Congestion Control FECN/BECN, Discard Eligible (DE)
Quality of Service User configurable DLCI priorities
Switch Compatibility Lucent 4ESS/5ESS, Nortel DMS-100/250, GTD-5, NI-1 and NI-2
Management Features
  • SNMP, MIB II (RFC1213), DS-1 MIB (RFC1406) and Enterprise MIBs
  • Loopbacks, QRSS test patterns
  • Alarm contacts
Frame Relay Performance Stats
  • TX/RX packets, state changes, signaling errors, TX/RX full status, TX/RX link integrity status, FECN/BECN count, DE count
  • Min/Max/Avg delay, dropped packets
Frame Relay Capacity
  • 300 PVCs per system
  • 5,500 packets per second
Operating Temperature 0° to +45°C
Storage Temperature -20° to +70°C (-4° to 158°F)
Relative Humidity Up to 95%, non-condensing
Dimensions 17.08" W, 11.67" D, 3.47" H
Weight 18.3 lbs.
  • AC Power: 90/240 VAC, 50/60Hz
  • DC Power: +24/-48 VDC
Agency Approvals
  • UL EN60950, CUL
  • CE Mark (AC only)
  • FCC Part 15 (Class A) and FCC Part 68
  • RoHS compliant (AC only)
Product Includes ATLAS System CD (Includes ADTRAN Utilities TFTP Server, VT100 Client, Telnet; System Manual; System MIBs; Application Notes; Module Quick Start Guides; ADOBE Acrobat Reader), one 15 ft RJ-48C straightthrough cable, one RJ-48 to DB-25 adapter, one 6 ft straight cable


ATLAS Deployment

Acting like a central office switch, the ATLAS 830 and ATLAS 550 can emulate Frame Relay, ISDN and analog circuits.Network engineers, design and test engineers and classroom instructors can easily stage real-world circuits and "what if" scenarios, test new technologies, or configure equipment without purchasing live circuits or incurring toll charges from a carrier.

For Frame Relay WAN emulation, both fully meshed and hub-and-spoke networks can be configured using the RFC 1490 protocol.

As an ISDN switch, the ATLAS can emulate both BRI and PRI dial-up networks. Both BRI and PRI support multiple switch types like the DMS 100, Lucent 5E and National ISDN, with additional support for the Lucent 4E switch with PRI. EuroISDN switch protocol is also supported for E1/PRA, BRI 'S/T' and BRI 'U' interfaces.

Supporting analog circuits, the ATLAS 550 can provide 1–32 analog loop start lines and the ATLAS 830 can provide 1–40 analog loop start lines.


Download the ADTRAN ATLAS 550 Datasheet (PDF).


ADTRAN Products
Integrated Access Device
ATLAS 550 Unit AC, with T1/PRI NIM, RoHS
Get a Quote!
ATLAS 550 Unit DC
Get a Quote!
ATLAS 550 System for T1-to-PRI Converter
Get a Quote!
ATLAS 550 System for Video Switch
Get a Quote!
ATLAS Modules
T1/PRI Module ROHS
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Octal FXS Module ROHS
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Dual T1/PRI Module ROHS
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Quad BRI ISDN (U) Module ROHS
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Quad BRI/ST Module ROHS
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Octal FXO Module
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Octal E&M Module
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Dual EIA-530 Module
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