Technical Documentation
Slot Numbering for an EX8208 Switch
An EX8208 chassis accepts eight line cards, two Switch Fabric and Routing Engine (SRE) modules, one Switch Fabric (SF) module, one fan tray, and six power supplies (AC or DC). All 11 slots for the line cards and the modules run horizontally across the front of the chassis. The fan tray slot runs vertically on the left of the chassis front. The six power supply slots run vertically across the front bottom of the chassis.
This topic describes:
Slot Numbering for SRE and SF Module Slots and Line Card Slots
Table 1 lists the slot numbers on the EX8208 chassis and the components those slots accept.
Table 1: Slot Numbering for an EX8208 Switch
Slot Label | Components Accepted in Slot |
|---|---|
0 | Line card |
1 | Line card |
2 | Line card |
3 | Line card |
SRE0 | SRE module |
SF | SF module |
SRE1 | SRE module |
4 | Line card |
5 | Line card |
6 | Line card |
7 | Line card |
Figure 1 shows the slot numbering, which is on the front left of the chassis.
Figure 1: Slot Numbering for an EX8208 Switch
Slots 0 through 7 accept one of the line cards available. See Installing a Line Card in an EX8200 Switch.
Slots SRE0 and SRE1 accept only the SRE module. You can install one SRE module or two SRE modules based on the configuration of your switch. See Switch Fabric and Routing Engine (SRE) Module in an EX8208 Switch.
 | Note: We recommend that you install two SRE modules for redundancy. If you install only one SRE module, we recommend that you install it in the slot SRE0. See Installing an SRE Module in an EX8208 Switch. |
Slot SF accepts only the SF module. See Switch Fabric (SF) Module in an EX8208 Switch. An EX8208 switch can have either zero SF modules or one SF module based on your switch configuration. The SF module is keyed so that it does not fit in any other slot in the chassis. See Installing an SF Module in an EX8208 Switch.
Slot Numbering for the Power Supply Slots
The chassis has six vertical slots on its front bottom. You can install up to six power supplies (either all AC or all DC) in these slots, which are labeled PSU 0 through PSU 5 (from left to right). Table 2 lists the slot numbers for the power supplies on an EX8208 switch. See AC Power Supply in an EX8200 Switch and DC Power Supply in an EX8200 Switch.
 | Caution: Mixing different types of power supplies in the same chassis is not a supported configuration. |
Table 2: Slot Numbering for Power Supply Slots on an EX8208 Switch Chassis Front
Slot Label | Components Accepted in Slot |
|---|---|
PSU 0 | Power supply |
PSU 1 | Power supply |
PSU 2 | Power supply |
PSU 3 | Power supply |
PSU 4 | Power supply |
PSU 5 | Power supply |
Figure 2 shows the slot numbering for the power supply slots in an EX8208 switch.
Figure 2: Slot Numbering for Power Supply Slots on an EX8208 Switch Chassis Front
| Note: Power supplies can be installed in any slot. You do not have to install them in serial order. See Installing an AC Power Supply in an EX8200 Switch and Installing a DC Power Supply in an EX8200 Switch. |
