Troubleshooting guide

Section 1, System Description - Introduction
61186003L1-1D 1-3
INTRODUCTION
This section of the ADTRAN MX2820 System Manual is designed for use by network
engineers, planners, and designers who are upgrading a communications network. It contains
general information and describes system components, system connectivity, and system
modules.
SYSTEM OVERVIEW
The ADTRAN MX2820 high-density M13/STS-1 multiplexer system offers bandwidth consoli-
dation at a low cost in a dense rackmount chassis. The MX2820 gives customers the ability to
easily install M13 or STS-1 modules on an “as needed” basis by simply inserting additional
modules.
• The MX2820 system demultiplexes a DS3 or STS-1 input signal into DSX-1 or E1 output
signals.
• The MX2820 system multiplexes DSX-1 or E1 input signals into DS3 or STS-1 output
signals.
In areas where multiple M13/STS-1 modules are needed, the MX2820 system frees up
valuable rack space with a high-density chassis. The MX2820 system with a 19-inch chassis
houses up to 14 MUX modules to provide seven redundant M13/STS-1 modules in 2U rack
units of space. The MX2820 system with a 23-inch chassis houses up to 18 MUX modules to
provide nine redundant M13/STS-1 modules in 2U rack units of space.
The MX2820 MUX modules are capable of combining independent T1s, E1s, or T1s and E1s
on the same DS3/STS-1 signal. Each pair of MUX modules provides built-in 1:1 redundancy
on the DS1 and DS3/STS-1 circuits. Advanced diagnostics include CSU loopbacks, NIU
loopbacks, Far-End Alarm Channel (FEAC) loopbacks, C-bit loopbacks, and built-in BERT (Bit
Error Rate Testing) capabilities.
As with all ADTRAN products, the MX2820 system offers comprehensive management
options. It features a VT100 terminal interface for configuration, loopbacks, and performance
monitoring. The MX2820 system has an integrated 10/100Base-T Ethernet port to support
IP-based management applications including TL1, SNMP, Telnet, and SSH.
Features and Benefits
The MX2820 high density M13/STS-1 multiplexer system provides the following features:
• Affordable DS3/STS-1 bandwidth consolidation
• Built-in 1:1 redundancy
• System Controller Unit (SCU) for centralized management
• Single IP address per shelf
• Interbank communications capability to address multiple shelves with a single IP via an
RS-485 daisy chain communication link between shelves
• Capable of backhauling multiple service types (T1/E1)
• TL1, SNMP, Telnet, and SSH management
• X.25 capability for TL1 sessions