№ Front panel element Description
9 [1 .. 8] 8 ports of Gigabit Ethernet 10/100/1000BASE-T (RJ-45)
10 Optical Port 4 ports of Gigabit Ethernet 10/100/1000BASE-X (SFP)
ESR-21 rear panel
The rear panel layout of ESR-21 is depicted in figure 25.
Figure 25 – ESR-21 rear panel
Table 22 lists rear panel connectors of the router.
Table 22 – Rear panel connectors description
№ Description
1 Earth bonding point of the device.
ESR-21 side panels
The side panel layout of ESR-21 is depicted in figures 26 and 27.
Figure 26 – ESR-21 left side panel
Figure 27 – ESR-21 right side panel
Side panels of the device have air vents for heat removal. Do not block air vents. This may cause the
components to overheat, which may result in device malfunction. For recommendations on device installation,
see section Installation and connection.
2.4.7 ESR-20 design
The device has a metal housing available for 19” form-factor rack mount; housing size is 1U.
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