Juniper EX2300-C Hardware Guide

Attenuation and Dispersion in Fiber-Optic Cable
An optical data link functions correctly provided that modulated light reaching the receiver
has enough power to be demodulated correctly. Attenuation is the reduction in strength
of the light signal during transmission. Passive media components such as cables, cable
splices, and connectors cause attenuation. Although attenuation is significantly lower
for optical fiber than for other media, it still occurs in both multimode and single-mode
transmission. An efficient optical data link must transmit enough light to overcome
attenuation.
Dispersion is the spreading of the signal over time. The following two types of dispersion
can affect signal transmission through an optical data link:
•
Chromatic dispersion, which is the spreading of the signal over time caused by the
different speeds of light rays.
•
Modal dispersion, which is the spreading of the signal over time caused by the different
propagation modes in the fiber.
For multimode transmission, modal dispersion, rather than chromatic dispersion or
attenuation, usually limits the maximum bit rate and link length. For single-mode
transmission, modal dispersion is not a factor. However, at higher bit rates and over longer
distances, chromatic dispersion limits the maximum link length.
An efficient optical data link must have enough light to exceed the minimum power that
the receiver requires to operate within its specifications. In addition, the total dispersion
must be within the limitsspecified for the type of link in TelcordiaTechnologiesdocument
GR-253-CORE (Section 4.3) and International Telecommunications Union (ITU)
document G.957.
When chromatic dispersion is at the maximum allowed, its effect can be considered as
a power penalty in the power budget. The optical power budget must allow for the sum
of component attenuation, power penalties (including those from dispersion), and a
safety margin for unexpected losses.
Related
Documentation
• Calculating the EX Series Switch Fiber-Optic Cable Power Budget on page 70
• Calculating the EX Series Switch Fiber-Optic Cable Power Margin on page 70
107Copyright © 2017, Juniper Networks, Inc.
Chapter 8: Transceiver and Cable Specifications

Juniper EX2300-C Specifications

General

Safety	UL-UL60950-1, C-UL CAN/CSA 22.2 No.60950-1, TUV/GS EN 60950-1, CB-IEC60950-1, EN 60825-1
Form factor	1U
Product color	Black
Rack mounting	Yes
Electromagnetic compatibility	FCC 47CFR 15 A, EN 55022 A, ICES-003 A, VCCI A, AS/NZS CISPR 22 A, EN 55024, EN 300386, CE
Console port	USB
SFP+ module slots quantity	2
Installed SFP modules quantity	0
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	12
Number of VLANs	4093
Networking standards	IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ah, IEEE 802.3u, IEEE 802.3z
Virtual LAN features	Tagged VLAN, Port-based VLAN
Copper ethernet cabling technology	10BASE-T, 100BASE-TX, 1000BASE-T
Power consumption (max)	20 W
Memory type	DRAM
Noise level	0 dB
Flash memory	2000 MB
Processor frequency	1250 MHz
Virtual stacking (units)	4
Operating altitude	0 - 1524 m
Non-operating altitude	1524 - 4877 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	0 - 95 %
Operating relative humidity (H-H)	10 - 85 %
Throughput	47 Mpps
Jumbo frames	9216
MAC address table	16000 entries
DHCP features	DHCP server, DHCP client
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, HTTPS, SNMP, SSH-2
Fiber ethernet cabling technology	1000BASE-X
Switch type	Managed
Switch layer	L2/L3

Weight and Dimensions

Depth	239 mm
Width	279 mm
Height	44 mm
Weight	2480 g