PN 76.8820IM30-A
Tellabs 8820 Multi-service Switch Router System Installation
2-10
Unpacking and Site Preparation
Site Preparation
Power Requirements
Power Requirements
Each 8820 MSR is provided as either an AC- or DC- powered model. All 8820 MSR
products must be hardwired to earth ground. The chassis earth ground point is an 8x32 lug
and lock nut located on the rear of the chassis. The earth ground wire size must be between
10AWG and 14AWG (
DC Power and Earth Ground
The 8820 MSR accommodates redundant power feeds. The unit can operate on only one
feed that meets the minimum requirements as presented in
. If the unit is installed
in a redundant power application, both feeds must be connected and compliant with the
minimum requirements. Power circuit breakers and earth ground connections are
presented in
.
Table 2-6
8820 MSR DC Power Limits
Description
Minimum
Maximum
Voltage
-40 VDC
-56.7 VDC
Current
7.5 Amps (at 40V)
Feed Fusing
12 Amps
15 Amps
Table 2-7
8820 MSR DC Circuit Breaker and Earth Ground
Item
Description
DC Power Circuit
Breaker
DC-power sources must be derived from a dedicated DC
branch circuit, and each branch circuit must be protected by a
dedicated circuit breaker. The installation site should have a
dedicated 15 Ampere, 1-pole circuit breaker with a medium
trip delay at each branch circuit.
Earth Ground
Mandatory: Connect an earth-ground cable to the 8x32 studs
located on the rear panel of the 8820 MSR.