Transition Networks
SISPM1040-3xxx-L Install Guide
33762 Rev. D
Page
28
of
50
Installing SFP Modules
You can install or remove a mini-GBIC SFP module from an SFP port without
having to power off the switch.
Note
: The SFP ports should use UL Listed Optional Transceiver product,
Rated 3.3Vdc, Laser Class 1.
See the SFP manual for specific cautions, warnings, and instructions.
See the
for our full range of Optical Devices.
1.
Insert the module into the SFP port.
2.
Press firmly to ensure that the module seats into the connector.
Connecting Powered Devices (PDs)
Note that this device does not
comply with IEEE 802.3at at 48‐51.4 VDC, or with IEE 802.3bt at 48‐53.4 VDC.
The old device label states 48‐57 VDC. The latest device label indicates:
•
802.3af: 48‐57VDC
•
802.3at: 52‐57VDC
•
802.3bt: 54‐57VDC
This device drops ~1.3V from Vin to PSEout. IEEE requires these PSEout voltages at the PSE output into the cable:
•
802.3af: 44VDC
•
802.3at: 50VDC
•
802.3bt: 52VDC
Not meeting this PSEout requirement may cause power up failures or power cycling with devices drawing
maximum power with maximum cable loss.
Connecting Power
The SISPM1040‐3248‐L/SISPM1040
-3166-
L has one AC power input and Dual DC power inputs. It doesn’t support
a secondary AC Power Supply option. It provides redundancy between AC and dual DC power inputs and the AC
power input has high priority. The switch can use DC and AC at the same time. For redundancy, AC takes priority
over DC; see the Install Guide.
Power Connection
:
Warning
:
Connect the power supply to the switch first, and then connect the power supply to
power. Otherwise catastrophic product failure may occur.
1.
Verify that power is off to the DC circuit that you are
going to attach to the switch PoE DC-input connector. This can be either of the two power supplies (AC-input or
DC-input) or site source DC.
2.
As an added precaution, place an appropriate safety flag and lockout device at the
source power circuit breaker, or place a piece of adhesive tape over the circuit breaker handle to prevent
accidental power restoration while you are working on the circuit.
