Mx2820 Shelf (19-Inch Or 23-Inch); General Features - ADTRAN MX2820 System Manual

MX2820 Shelf (19-inch or 23-inch)

This system consists of either a 19-inch wide or 23-inch wide by 3.5-inch high (2U) shelf. The
19-inch shelf can house seven redundant pairs of M13 or STS-1 MUX modules. The 23-inch
shelf can house nine redundant pairs of M13 or STS-1 MUX modules. Each M13 or STS-1 pair
provides equipment protection only. Three additional slots are available to house common
modules. One slot houses the SCU, which is used for system management. The other two slots
house redundant Clock Modules.
The shelf backplane provides connectivity between external interfaces and the SCU, and
provides connectivity between the SCU and the MUX modules.

General Features

The MX2820 shelves provide the following features:
• RJ-45 connector used as 10/100Base-T Ethernet port for Telnet, TL1, SNMP, TFTP, and
SSH
• DB-25 connector used as an RS-232 interface for synchronous X.25
• Wire-wrap posts used as an RS-485 interface for daisy chaining to multiple MX2820
shelves
• Wire-wrap posts used as alarm relay contacts for Critical, Major, and Minor alarms
• Wire-wrap posts used as environmental alarm inputs: ACO, AUX1, AUX2, AUX3A and
AUX3B
• Barrier strip connector to connect frame ground and redundant VDC power (–48 or ±24
VDC as appropriate)
• Backplane supports communication between the SCU, the MUX modules, and two Clock
Modules
• DSX-1 level access is provided through FutureBus connectors
• DSX-3 level access is provided through BNC connectors
• 2U-high shelf mounts in 19-inch and 23-inch racks
• Operates over temperature range of –40°C to +50°C (no fans); –40°C to +65°C (with fans)
• Wire-wrap posts for external redundant BITS clocks
61186003L1-1D
Section 1, System Description - System Components
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