Network Interfaces; Ds3/Sts-1 Interface; Dsx-1 (T1/E1) Interface; Management Interfaces - ADTRAN MX2820 System Manual

MX2820 System Manual

Network Interfaces

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.
Each MUX module accepts a single DS3 or STS-1 input signal from the network side and
provides 28 DSX-1 or 21 E1 outputs. For 1:1 redundant system, the MX2820 system provides
two MUX modules for each DS3 or STS-1 signal.

DS3/STS-1 Interface

The MX2820 backplane accommodates each DS3/STS-1 transmit and receive signal via two
75-ohm BNC female connectors.

DSX-1 (T1/E1) Interface

The MX2820 backplane accommodates DSX-1 (T1/E1) Transmit Tip, Transmit ring, Receive
Tip, and Receive Ring signals via two FutureBus connectors, one for transmit pairs and one
for receive pairs.

Management Interfaces

Craft Port

DB-9 female connector on the SCU front panel provides an RS-232 serial VT100 interface.

Network Management

DB-25 connector on the shelf backplane provides an RS-232 interface for a synchronous X.25
connection.

RJ-45 for 10/100Base-T

RJ-45 female connector on the shelf backplane provides an Ethernet interface to allow Trans-
mission Control Protocol/Internet Protocol (TCP/IP) communication.

RS-485

Wire-wrap posts are used as an RS-485 interface to allow daisy chaining multiple MX2820
shelves.

Alarms

Alarm Relay Contacts

Wire-wrap posts provide alarm relay contacts for Critical, Major, and Minor alarms. Each
alarm can be individually wired for Normally Open or Normally Closed.
The Critical alarm relay can be used to indicate loss of power to the shelf.
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