3Com 3CNJPSE24 Datasheet - page 3
3 C O M
®
P O W E R O V E R E T H E R N E T M U LT I P O R T M I D S PA N S O L U T I O N D ATA S H E E T
3
Specifications
Device Ports, Connectors
24 MDI-X device ports
Device connectors: shielded
RJ-45, EIA 568A/568B
Management connectors:
DB-9 female port
Cables and Operating Distances
Category 5 or 5e, UTP or STP
Ethernet cabling up to 100 m
(328 ft)
Data Output
Pin assignments: data transmit-
ted over wiring-pair pins 1/2
and 3/6
Rates: autonegotiating
10BASE-T or 100BASE-TX
Device Detection
P802.3af-compliant resistive
power discovery algorithm with
25 K
Ω resistor in the powered
device
Incoming Power Requirements
AC voltage: 88-264 VAC
AC frequency: 47-63 Hz
AC current: 3.5 A @ 110 VAC,
1.8 A @ 240 VAC
DC current: 10 A @ 48 V
Volt amperes rating: 0.48 KVA
(-48 V) 0.30 KVA (110 VAC)
Power over Ethernet Output
Pin assignments and polarity:
power transmitted over unused
wiring-pair pins 4/5 (RTN) and
7/8 (-V)
Voltage: -48 VDC
Device ports: 15.4 W minimum
per port
Cumulative: 200 W total output
Power feeding: P802.3af-compli-
ant devices can be connected
directly to existing standard
Category 5/5e-cabled LANs; for
nonstandard or unpowered
devices, an external splitter can
be installed to separate power
and data transmissions into two
separate outputs terminating at
the end device; phone products
can receive power by installing
a power module between the
phone and power source
LED Indicators
AC power: green/orange
DC power: green/orange
User/channel power:
green/orange
Dimensions
Height: 4.4 cm (1.75 in); 1 RU
Width: 43.3 cm (17.0 in);
19-inch rack
Depth: 30.2 cm (11.9 in)
Weight
4 kg (8.8 lbs)
Environmental
Temperature: 0° to 40° C (32° to
104° F) operating; -20° to 75° C
(-4° to 167° F) storage
Humidity (noncondensing): Up to
90 percent operating; up to 95
percent storage
Altitude: -304.8 to 3,048 m
(-1,000 to 10,000 ft) operating
Thermal rating: 285 BTU
Networking Standards
Compliance
802.3 (unpowered state), 802.3u,
P802.3af (draft)
Regulatory Compliance
CE marking, C-tick
Electromagnetic Compliance
FCC Part 15 Class B, ICES-003
Class B, EN55022 Class B (emis-
sion), EN55024 (immunity),
VCCI (Japan), MIC (Korea)
Safety Approvals
UL/cUL 60950; EN 60950;
GS mark, IEC 60950,
NOM-001-SCFI-1993 (Mexico)
Feature
Benefit
Compatibility, Reliability
IEEE P802.3af compliant
Complies with the P802.3af draft specifica-
tion standard for interoperability with a wide
range of network devices.
Smart Ethernet wiring
Provides data and power over the same
network wiring; power is transmitted over
unused wiring pairs, keeping it separate
from data wiring pairs.
Shielded power
Reduces signal interference (crosstalk)
and insertion losses via shielded connectors,
intelligent wiring layout, and optimized
line termination.
Power Management
Advanced autosensing algorithm
Detects and tests devices using resistive
power discovery scheme; backwards
compatible with draft standard and
prestandard detection algorithms.
Power management
Controls power output to stay within power
budgets.
LED displays
Provides real-time network monitoring
through bicolor LEDs on the front panel.