Commutateur Ethernet industriel IDS-108F

Commutateur rail DIN compact 8 à 10 ports

8 Port Industrial Ethernet Switch
  • 5 ports 10/100Base-TX (RJ45)
  • 8 ports 10/100Base-TX ( RJ45 ) plus 1 ou 2 ports fibre SC/ST.
  • Certification pour emplacement dangereux et équipement de contrôle industriel
  • Boîtier aluminium IP30 résistant à la corrosion
  • Alimentation double redondante 12/24/48 VDC, 18 à 30 VAC
  • Protection contre les surcharges de courant et les inversions de polarité
  • Prise en charge des températures d'exploitation industrielles de -40 à 75C
Demande de Devis Question sur le produit?

Les Commutateurs Ethernet industriels Perle sont conçus pour résister aux températures extrêmes, pics, vibrations, et chocs présents dans les applications industrielles d'automatisation, gouvernementales, militaires, pétrolières et du gaz, minières et à l'extérieur.

IDS-108F est un commutateur Ethernet industriel 8 à 10 ports offrant une performance avancée autorisant une exploitation réseau déterministe en temps réel. Il n'exige aucune configuration et fonctionne immédiatement, dès sa mise sous tension.

IDS-108F est proposé en différents modèles avec 8 ports cuivre plus 1 port fibre ou 8 ports cuivre plus 2 ports fibre. Tous les modèles sont des commutateurs robustes sans ventilateur destinés à une utilisation industrielle pour une fiabilité supérieure de 0 à 60 °C, ou dans des températures d'exploitation de -40 à 75 °C.

Perle conçoit du matériel industriel pour les environnements série ModBus et de conversion Profinet à Ethernet depuis plus de 35 ans et utilise cette expertise pour concevoir les commutateurs Ethernet les plus robustes du marché. Ne confiez pas vos communications critiques à des commutateurs classiques. Les commutateurs Ethernet industriels de Perle vous donnent une garantie de fonctionnement fiable de votre système pour plusieurs années.

Fonctions du Commutateur Ethernet Industriel IDS-108F

Conception robuste pour les environnements agressifs
  • Boîtier aluminium IP30 résistant à la corrosion
  • Certification UL508A de sécurité des équipements de contrôle industriel
  • Les lieux dangereux - Classe 1/Div2, ATEX Classe1/Zone2
Fonctionnement fiable
  • Sans ventilateur, pas de pièces mouvantes
  • Double alimentation.
  • Connexion à des sources d'alimentation séparée pour la redondance.
  • Protection contre l'inversion de polarité
  • Protection contre les surcharges de courant
  • Prend en charge les conditions de vibration et de choc que l'on trouve dans les environnements industriels
Performance Ethernet en temps réel
  • Transmission à la vitesse du fil, commutation stockage et transfert, architecture non bloquante
  • Auto-détection pour vitesse et duplex
  • Auto-mdi/mdix-crossover fonctionne avec les câbles droits et croisés
Power
Dual
Power
Input		 Both inputs draw power simultaneously. If one power source fails, the other live source can, acting as a backup, supply enough power to meet the operational needs of the switch.

12/24/48 VDC Nominal. ( 9.6 to 60 VDC)
18 to 30 VAC
Power Connector 4-Pin Removable Terminal Block.
Grounding screw on metal chassis
Maximum Current Consumption
@24 vDC		 360 mA
Maximum Power
Consumption
@24 vDC		 8.6 Watts
Overload
Current
Protection		 Reset-able fuse provides overload current protection
Reverse
polarity
protection		 The positive and negative inputs can be reversed providing safe and simple power connectivity.
Access Ports
RJ45 8 shielded RJ45 ports for 10/100Base-TX up to 100 meters ( 328 ft )
Auto-negotiation
Auto-MDI/MDIX-crossover for use with either crossover over straight-through cable types
Ethernet isolation 1500 V
Fiber port 1 or 2 fixed fiber port models
Duplex SC or ST connector
  • Multimode 50/125 or 62.5/125 micron fiber cable
  • Single mode 9/125 micron fiber cable
Simplex ( BIDI, single strand ) SC connector
  • Multimode 50/125 or 62.5/125 micron fiber cable
  • Single mode 9/125 micron fiber cable
PC and UPC type patch cords supported.
Fixed
Fiber
Port
Specs
Fiber1
Type		 Transmit
(dBm)		 Receive
(dBm)		 Power
Budget
(dB)		 Wavelength
(nm)		 IEEE Core
Size
(um)		 Modal
Bandwidth
(MHz
*Km)		 Maximum
Operating
Distance
Min Max Min Max
MMF
(Duplex
SC/ST)		 -20.0 -12.0 -31.0 -14.0 11.0 1310 100Base-FX 50 800* 5 Km
3.1 mi
62.5 500* 4 Km
2.5 mi
62.5 200 2 Km
1.2 mi
MMF
(Simplex
SC)		 -15.0 0.0 -28.0 -8.0 13.0 1310 / 1550
1550 / 1310		 100Base-BX-U
100Base-BX-D		 62.5 200 2 Km
1.2 mi
SMF
(Duplex
SC/ST)		 -18.0 -7.0 -32.0 -3.0 14.0 1310 100Base-LX 9 ** 20 Km
12.4 mi
SMF
(Simplex
SC)		 -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550
1550 / 1310		 100Base-BX-U
100Base-BX-D		 9 ** 20 Km
12.4 mi
SMF
(Duplex
SC/ST)		 -5.0 -0.0 -34.0 -3.0 29.0 1310 100Base-EX 9 ** 40 Km
24.9 mi
SMF
(Simplex
SC)		 -8.0 -3.0 -33.0 -3.0 18.0 1310 / 1550
1550 / 1310		 100Base-BX-U
100Base-BX-D		 9 ** 40 Km
24.9 mi
SMF
(Duplex
SC/ST)		 -5.0 0.0 -34.0 -3.0 29.0 1550 100Base-ZX 9 ** 80 Km
49.7 mi
SMF
(Duplex
SC/ST)		 0.0 5.0 -35.0 -3.0 35.0 1550 100Base-ZX 9 ** 120 Km
74.6 mi

* 1db/km multimode fiber cable

** as per ITU-T G.652 SMF specifications

Switch Properties
Standards
  • IEEE 802.3 for 10Base-T
  • IEEE 802.3u for 100Base-TX and 100Base-FX
  • IEEE 802.3x for Flow Control
Processing Type Store and Forward, non-blocking architecture
MAC Address Table Size 8K
Packet Buffer Memory 1 Mbit
Indicators
P1 This green LED is turned on when power is applied to the power #1 input
P2 This green LED is turned on when power is applied to the power #2 input
RJ45 Ethernet These integrated colored LEDs indicate link, activity and speed for each port.
Fiber Link Fiber link LED indicates Link and Data Activity
Environmental Specifications
Operating Temperature Ranges Standard temperature models : 0° C to 60° C (32° F to 140° F).
Industrial extended temperature models : -40° C to 75° C ( -40 F to 167° F )
Storage Temperature Range Minimum range of -25° C to 70° C (-13° F to 158° F). -40 C to 85 C (-40 F to 185 F) for industrial extended temperature models
Operating Humidity Range 5% to 90% non-condensing
Storage Humidity Range 5% to 95% non-condensing
Operating Altitude Up to 3,048 meters (10,000 feet)
Chassis Aluminum with an IP30 ingress protection rating
Din Rail Mountable DIN Rail attachment included. Mounts to standard 35 mm DIN rail in accordance with DIN EN 60175.
Removable to accommodate optional Panel/Wall mount kit
Maximum Heat Output 29.3 BTU/Hr
MTBF 623,989 hours (without fiber module)
389,062 hours (with 1 fiber module)
347,577 hours (with 2 fiber modules)
MTBF Calculation model based on MIL-HDBK-217-FN2 @ 30 °C
Product Weight and Dimensions
Weight 0.32 Kg x 0.7 lbs
Dimensions 35.5 x 111 x 138 mm, 1.39 x 4.37 x 5.43 inches
Packaging
Shipping Weight 0.47 Kg, 1.04 lbs
Shipping Dimensions 170 x 260 x 70 mm, 6.69 x 10.24 x 2.76 inches
Contents Shipped Industrial Ethernet Switch with DIN Rail attachment
Terminal block
Installation guide
Standards and Certifications
Safety UL 60950-1
CSA C22.2 No. 60950-1
IEC 60950-1:2005+A1:2009 and
EN 60950-1:2006+A11:2009+A1:2010+A12:2011
CE Mark
UL508 ( Industrial )
EMC Emissions FCC 47 Part 15 Class A
ICES-0003
CISPR 22:2008/EN55022:2010 (Class A)
EN61000-6-4
EMC Immunity CISPR 24:2010/EN 55024:2010
IEC/EN 61000-4-2 (ESD) : Contact discharge +/- 4kV, Air Discharge +/- 8kV
IEC/EN 61000-4-3 (RS) : 80 MHz to 2.7 Ghz ; 10V/m, 800 MHz to 1000 MHz; 20V/m
IEC/EN 61000-4-4 (EFT) : DC power line +/- 2 kV, Data Line +/- 2kV
IEC/EN 61000-4-5 (Surge) : DC power line, Line/Line +/- 1kV, Line/Earth +/- 2kV, Data Line line/earth +/- 1kV
IEC/EN 61000-4-6 (CS) : 150kHz to 80 MHz; 10V
IEC/EN 61000-4-8 (Magnetic Field): 30 A/m
IEC/EN 61000-6-2 ( General Immunity in Industrial Environments )
Industrial Safety UL508 (Safety standard for Industrial Control Equipment )
CSA C22.2 No. 142
Hazardous Locations
( Hazloc )		 ANSI/ISA 12.12.01, Class I Division 2 Groups A-D ( formerly known as UL 1604 )
CSA C22.2 No. 213
ATEX Class I Zone 2, EN60079-0,15
Laser Safety EN 60825-1:2007
Fiber optic transmitters on this device meet Class 1 Laser safety requirements per IEC-60825 FDA/CDRH standards and comply with 21CFR1040.10 and 21CFR1040.11.
Environmental Reach, RoHS and WEEE Compliant
Other ECCN: 5A991
HTSUS Number: 8517.62.0050
5 year warranty
IDS-108F avec rail DIN standard

Click on image to see larger version

IDS-108F DIN Rail Mechanical Drawing
IDS-108F avec fixations murales/sur panneau en option

Click on image to see larger version

IDS-108F Panel Mount Mechanical Drawing
Diagramme du commutateur industriel IDS-108F
Commutateur industriel IDS-108F - Schéma de réseau
Fibre Mode simple / Fil simple ( WDM )

Connexion de dispositifs sur une fibre simple (également appelée bidirectionnelle ou BiDi ou Simplex)

Pour réduire les coûts, ou lorsque la fibre disponible est limitée, on peut utiiser la technologie Wavelength-Division Multiplexing (WDM). WDM utilise des fréquences de transmission et de réception séparées pour communiquer sur une seule fibre. WDM emploie des fréquences distinctes de transmission et de réception pour communiquer sur le même brin de fibre optique. Cette technologie exploite les propriétés de transmission simultanée d'ondes lumineuses sur plusieurs longueurs d'ondes simultanément, sans interaction entre ces dernières. Les systèmes WDM se répartissent en différents types de longueurs d'ondes : classique/grossier (CWDM) et dense (DWDM).

Schéma d’Application Fibre Simple

Quand on utilise une fibre simple, il faut avoir un côté 'Haut' et un côté 'Bas' pour réaliser l'interconnexion des dispositifs fibre.

Perle propose une large gamme de commutateurs Ethernet fibre simple ('Haut/Bas') et de Convertisseurs de médias destinés à une seule fibre.

Select a Model to obtain a Part Number – IDS-108F

Operating Temperature (Std) = 0° C to 60° C (32° F to 140° F)

Models with 8 x 10/100/1000Base-T ( RJ45 ) Connectors
Model
Choose your Fiber Connections from the table below
1000Base-X Duplex Fiber
Fiber
Connector
Transmit
(dBm)
Receive
(dBm)
Power
Budget
(dB)
Wavelength
(nm)
Fiber
Type
Operating
Distance
Min
Max
Min
Max
IDS-108F
NO Fiber Connection
IDS-108F-M2SC2 1 x Duplex SC -20.0 -12.0 -31.0 -14.0 11.0* 1310 MMF 5 km*
(3.1 mi)
IDS-108F-M2ST2 1 x Duplex ST -20.0 -12.0 -31.0 -14.0 11.0* 1310 MMF 5 km*
(3.1 mi)
IDS-108F-S2SC20 1 x Duplex SC -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-S2ST20 1 x Duplex ST -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-S2SC40 1 x Duplex SC -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-S2ST40 1 x Duplex ST -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-S2SC80 1 x Duplex SC -5.0 0.0 -34.0 -3.0 29.0 1550 SMF 80 km
(50 mi)
IDS-108F-S2ST80 1 x Duplex ST -5.0 0.0 -34.0 -3.0 29.0 1550 SMF 80 km
(50 mi)
IDS-108F-S2SC120 1 x Duplex SC 0.0 5.0 -35.0 -3.0 35.0 1550 SMF 120 km
(75 mi)
IDS-108F-S2ST120 1 x Duplex ST 0.0 5.0 -35.0 -3.0 35.0 1550 SMF 120 km
(75 mi)
IDS-108F-DM2SC2 2 x Duplex SC -20.0 -12.0 -31.0 14.0 11.0* 1310 MMF 2 km
(1.2 mi)
IDS-108F-DM2ST2 2 x Duplex ST -20.0 -12.0 -31.0 14.0 11.0* 1310 MMF 2 km
(1.2 mi)
IDS-108F-DS2SC20 2 x Duplex SC -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS2ST20 2 x Duplex ST -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS2SC40 2 x Duplex SC -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-DS2ST40 2 x Duplex ST -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-DS2SC80 2 x Duplex SC -5.0 0.0 -34.0 -3.0 29.0 1550 SMF 80 km
(50 mi)
IDS-108F-DS2ST80 2 x Duplex ST -5.0 0.0 -34.0 -3.0 29.0 1550 SMF 80 km
(50 mi)
IDS-108F-DS2SC120 2 x Duplex SC 0.0 5.0 -35.0 -3.0 35.0 1550 SMF 120 km
(75 mi)
IDS-108F-DS2ST120 2 x Duplex ST 0.0 5.0 -35.0 -3.0 35.0 1550 SMF 120 km
(75 mi)

* 1db/km multimode 50/125 micron fiber cable

Single Fiber ( Simplex / BiDi ) Models ( Recommended use in pairs )

Models with 8 x 10/100/1000Base-T ( RJ45 ) Connectors
Model
Choose your Fiber Connections from the table below
100Base-BX Simplex ( BiDi ) Fiber
Fiber
Connector
Transmit
(dBm)
Receive
(dBm)
Power
Budget
(dB)
Wavelength
(nm)
TX / RX
Fiber
Type
Operating
Distance
Min
Max
Min
Max
IDS-108F-M1SC2U 1 x Simplex SC -15.0 0.0 -28.0 -8.0 13.0 1310 / 1550 MMF 2 km
(1.2 mi)
IDS-108F-M1SC2D 1 x Simplex SC -15.0 0.0 -28.0 -8.0 13.0 1550 / 1310 MMF 2 km
(1.2 mi)
IDS-108F-DM1SC2U 2 x Simplex SC -15.0 0.0 -28.0 -8.0 13.0 1310 / 1550 MMF 2 km
(1.2 mi)
IDS-108F-DM1SC2D 2 x Simplex SC -15.0 0.0 -28.0 -8.0 13.0 1550 / 1310 MMF 2 km
(1.2 mi)
IDS-108F-M1ST2U 1 x Simplex ST -15.0 0.0 -28.0 -8.0 13.0 1310 / 1550 MMF 5 km
(3.1 mi)
IDS-108F-M1ST2D 1 x Simplex ST -15.0 0.0 -28.0 -8.0 13.0 1550 / 1310 MMF 5 km
(3.1 mi)
IDS-108F-DM1ST2U 2 x Simplex ST -15.0 0.0 -28.0 -8.0 13.0 1310 / 1550 MMF 5 km
(3.1 mi)
IDS-108F-DM1ST2D 2 x Simplex ST -15.0 0.0 -28.0 -8.0 13.0 1550 / 1310 MMF 5 km
(3.1 mi)
IDS-108F-S1ST20U 1 x Simplex ST -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550 SMF 20 km
(12.4 mi)
IDS-108F-S1ST20D 1 x Simplex ST -14.0 -8.0 -32.0 -3.0 18.0 1550 / 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS1ST20U 2 x Simplex ST -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550 SMF 20 km
(12.4 mi)
IDS-108F-DS1ST20D 2 x Simplex ST -14.0 -8.0 -32.0 -3.0 18.0 1550 / 1310 SMF 20 km
(12.4 mi)
IDS-108F-S1SC20U 1 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550 SMF 20 km
(12.4 mi)
IDS-108F-S1SC20D 1 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1550 / 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS1SC20U 2 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550 SMF 20 km
(12.4 mi)
IDS-108F-DS1SC20D 2 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1550 / 1310 SMF 20 km
(12.4 mi)
IDS-108F-S1SC40U 1 x Simplex SC -8.0 -3.0 -33.0 -3.0 25.0 1310 / 1550 SMF 40 km
(25 mi)
IDS-108F-S1SC40D 1 x Simplex SC -8.0 -3.0 -33.0 -3.0 25.0 1550 / 1310 SMF 40 km
(25 mi)
IDS-108F-DS1SC40U 2 x Simplex SC -8.0 -3.0 -33.0 -3.0 25.0 1310 / 1550 SMF 40 km
(25 mi)
IDS-108F-DS1SC40D 2 x Simplex SC -8.0 -3.0 -33.0 -3.0 25.0 1550 / 1310 SMF 40 km
(25 mi)

Industrial Ethernet Switch Accessories
Panel Mount kit PM3 Brackets for attaching 30 to 45 mm wide Perle IDS industrial switches inside a control panel or to a wall.
Rack Mount Kit RM4U Bracket for mounting one or more Perle DIN Rail switches in a standard 19” rack. Occupies “4U” of vertical rack space. 275 mm ( 10 inches ) deep
DIN Rail 24V Power Supply IDPS-24-40-XT - DIN-Rail 24 VDC , 40Watt power supply with universal 85 to 264 VAC or 120-370 VDC input , -20 to 70°C extended operating temperature. Power Supply Specifications.
UNO-PS/1AC/24DC/150W Power Supply UNO-PS/1AC/24DC/150W Power Supply - DIN-Rail 24 VDC , 150 Watt power supply with universal 85 to 264 VAC, -25 to 70°C extended operating temperature. Power Supply Specifications.

Select a Model to obtain a Part Number – IDS-108F

Operating Temperature (Ind) = -40° C to 75° C ( -40 F to 167° F )

Models with 8 x 10/100/1000Base-T ( RJ45 ) Connectors
Model
Choose your Fiber Connections from the table below
1000Base-X Duplex Fiber
Fiber
Connector
Transmit
(dBm)
Receive
(dBm)
Power
Budget
(dB)
Wavelength
(nm)
Fiber
Type
Operating
Distance
Min
Max
Min
Max
IDS-108F-XT
NO Fiber Connection
IDS-108F-M2SC2-XT 1 x Duplex SC -20.0 -12.0 -31.0 -14.0 11.0* 1310 MMF 5 km*
(3.1 mi)
IDS-108F-M2ST2-XT 1 x Duplex ST -20.0 -12.0 -30.0 -14.0 10.0* 1310 MMF 5 km*
(3.1 mi)
IDS-108F-S2SC20-XT 1 x Duplex SC -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-S2ST20-XT 1 x Duplex ST -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-S2SC40-XT 1 x Duplex SC -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-S2ST40-XT 1 x Duplex ST -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-DM2SC2-XT 2 x Duplex SC -20.0 -12.0 -31.0 14.0 11.0* 1310 MMF 2 km
(1.2 mi)
IDS-108F-DM2ST2-XT 2 x Duplex ST -20.0 -12.0 -30.0 14.0 10.0* 1310 MMF 2 km
(1.2 mi)
IDS-108F-DS2SC20-XT 2 x Duplex SC -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS2ST20-XT 2 x Duplex ST -18.0 -7.0 -32.0 -3.0 14.0 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS2SC40-XT 2 x Duplex SC -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)
IDS-108F-DS2ST40-XT 2 x Duplex ST -5.0 0.0 -34.0 -3.0 29.0 1310 SMF 40 km
(25 mi)

* 1db/km multimode 50/125 micron fiber cable

Single Fiber ( Simplex / BiDi ) Models ( Recommended use in pairs )

Models with 8 x 10/100/1000Base-T ( RJ45 ) Connectors
Model
Choose your Fiber Connections from the table below
100Base-BX Simplex ( BiDi ) Fiber
Fiber
Connector
Transmit
(dBm)
Receive
(dBm)
Power
Budget
(dB)
Wavelength
(nm)
TX / RX
Fiber
Type
Operating
Distance
Min
Max
Min
Max
IDS-108F-S1SC20U-XT 1 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550 SMF 20 km
(12.4 mi)
IDS-108F-S1SC20D-XT 1 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1550 / 1310 SMF 20 km
(12.4 mi)
IDS-108F-DS1SC20U-XT 2 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1310 / 1550 SMF 20 km
(12.4 mi)
IDS-108F-DS1SC20D-XT 2 x Simplex SC -14.0 -8.0 -32.0 -3.0 18.0 1550 / 1310 SMF 20 km
(12.4 mi)

Industrial Ethernet Switch Accessories
Panel Mount kit PM3 Brackets for attaching 30 to 45 mm wide Perle IDS industrial switches inside a control panel or to a wall.
Rack Mount Kit RM4U Bracket for mounting one or more Perle DIN Rail switches in a standard 19” rack. Occupies “4U” of vertical rack space. 275 mm ( 10 inches ) deep
DIN Rail 24V Power Supply IDPS-24-40-XT - DIN-Rail 24 VDC , 40Watt power supply with universal 85 to 264 VAC or 120-370 VDC input , -20 to 70°C extended operating temperature. Power Supply Specifications.
UNO-PS/1AC/24DC/150W Power Supply UNO-PS/1AC/24DC/150W Power Supply - DIN-Rail 24 VDC , 150 Watt power supply with universal 85 to 264 VAC, -25 to 70°C extended operating temperature. Power Supply Specifications.
Haut de page