Nortel Ethernet Switch 425-24T + EU Power Cord AL2012B41-E5 用户手册

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Simple Network Time Protocol

Simple Network Time Protocol (SNTP)
allows you to configure the switch to
synchronize Universal Coordinated Time
(UCT) to an accuracy of one second.
This feature adheres to the IEEE RFC
2030 (MIB is the s5agent). With this
feature, the system can obtain the time
from any RFC 2030-compliant NTP/
SNTP server. Additionally, the Ethernet
Switch supports the capability to modify
the time zone reported by the switch
and automatically adjust the time for
daylight savings. 

RMON

Network management begins with 
the device. Ethernet Switch 425
models support four groups of Remote
Monitoring (RMON) on all ports and
are SNMPv3 compliant. The four
groups of RMON are Alarms, Events,
History and Statistics. RMON2 support
is achievable via port mirroring and the
use of an external probe. The SNMP
agent software resides in the switch and
uses the information it collects to provide
management for all ports in the stack,
providing comprehensive network
monitoring capabilities.

Summary

With more than 100 years in telecommu-
nications, Nortel is uniquely positioned
to help your business reduce cost by
combining voice and data into an inte-
grated system. Why take a chance on a
vendor that only understands part of the
equation? Let us show you how the
Ethernet Switch 425, along with other
Nortel products, can increase your prof-
itability, streamline your business opera-
tions, increase productivity and help
you gain the competitive edge.

Physical specifications

Weight: 3 kg (6.61 lb)

Height: 4.37 cm (1.72 in)

Width: 43.82 cm (17.25 in)

Depth: 22.91 cm (9.02 in)

Weight: 3.1 kg (6.83 lb)      

Height: 4.37 cm (1.72 in)

Width: 43.82 cm (17.25 in)

Depth: 22.91 cm (9.02 in)

Performance

Switch fabric bandwidth—16 Gbps

Frame forwarding rate— 

Ethernet Switch 425-24T  6.6 million packets per second (Mpps) 
Ethernet Switch 425-48T  10.1 million packets per second (Mpps)

Switched 10 Mbps forwarding rate—14,880 pps maximum

Switched 100 Mbps forwarding rate—148,810 pps maximum

Switched 1000 Mbps forwarding rate—1,488,810 pps maximum

Memory—32MB memory architecture shared by all ports 

4MB Flash Memory 
16MB SDRAM

Address database size—8,000 entries at line rate

Addressing—48-bit MAC address

Frame length—64 to 1518 bytes (IEEE 802.1Q Untagged)

68 to 1522 bytes (IEEE 802.1Q Tagged)

Interface options

10BASE-T/100BASE-TX
RJ-45 (8-pin modular) connectors for Auto MDI/MDI-Xinterface
with auto-polarity

1000BASE-SX

Uses short wavelength 850 nm MTRJ or LC type fiber optic
connectors to connect devices over multimode (275m, 62.5um
core or 550m, 50.0um core) fiber optic cable.

1000BASE-LX
Uses long wavelength 1300nm duplex LC type fiber optic
connector to connect devices over single mode (10km, 9um core)
fiber optic cable.

Network protocol and standards compatibility

• IEEE 802.3 10BASE-T (ISO/IEC 8802-3, Clause 14)

• IEEE 802.3u 100BASE-TX (ISO/IEC 8802-3, Clause 25)

• IEEE 802.3u Autonegotiation on Twisted Pair (ISO/IEC 8802-3,

Clause 28)

• IEEE 802.3x (Flow Control on the Gigabit Uplink ports)

• IEEE 802.3z Gigabit

• IEEE 802.1d MAC Bridges (ISO/IEC 10038)

• IEEE 802.1p (Prioritizing)

• IEEE 802.1Q (VLAN Tagging)

• IEEE 802.1D (Spanning Tree Protocol)

• IEEE 802.3ad (manual/static)

• IEEE 802.3ad (LACP) 

• IEEE 802.1s 

• IEEE 802.1w 

Technical specifications