Rack Mounting the Switch
Important! The rack mounting procedure is identical for all modular switches. Illustrations in this chapter depict the mounting of an unpopulated DCS-7304 chassis.

Les procédure de montage du bâti est identique pour tous les commutateurs modulaires. Illustrations dans ce chapitre montrent le montage d’un châssis de DCS-7304 inhabité.
Section 3.1 provides instructions for mounting the switch in a two-post rack.
Section 3.2 provides instructions for mounting the switch in a four-post rack.
After completing the instructions for your rack type, proceed to Chapter 4.
3.1 Two-Post Rack Mount
To mount the switch to a two-post rack, assemble mounting brackets to the middle of the chassis, then attach the brackets to the rack.
Important! Two-post rack mount parts are only available through your sales representative. Two-post rack mounting is not supported for DCS-7316 switches.

Pièces de montage rack à deux montants sont uniquement disponibles par l’intermédiaire de votre représentant des ventes. Montage en rack de deux-poteau n’est pas supporté pour les commutateurs DCS-7316.
The accessory kit includes the following two-post mounting parts:
2 center-mount brackets
16 (DCS-7304) or 20 (DCS-7308) M4x8 panhead Phillips screws
3.1.1 Attaching Mounting Brackets to the Chassis
Step 1 Orient the switch chassis and the two center-mount brackets ( Figure 3-1).
Position the flanges that attach to the rack posts toward the front of the chassis.
Step 2 Attach both center-mount brackets to the chassis with the provided M4x8 panhead Phillips screws. Secure the bracket by attaching screws through each bracket hole.
3.1.2 Inserting the Switch into the Rack
Step 1 Move the chassis to the rack using a mechanical lift ( Figure 3-2-left).
If modules are inserted in the chassis, use the lift carefully to avoid damaging any components.
Step 2 Lift the chassis into the rack. Position the flanges against the rack posts ( Figure 3-2-right).
Step 3 Select mounting screws that fit your equipment rack.
Figure 3-1: Attaching the Center-mount Brackets
 
Figure 3-2: Lifting the Switch Chassis into the Two Post Rack
Step 4 Attach the bracket flanges to the rack posts. Secure the switch to the rack with screws through each bracket hole.
After completing the Two-Post Installation, proceed to Chapter 4.
3.2 Four-Post Rack Mount
The switch is mounted onto a four-post rack by assembling a shelf into the rack, then attaching the switch on the shelf. The four-post rack mount instructions include these sections:
3.2.1 Component Description
The four-post mount accessory kit contains these components:
1 Left Shelf and 1 Right Shelf ( Section 3.2.1.1)
2 Mounting Ears ( Section 3.2.1.2)
Note Components are designed for tool-less installation in square-hole racks. To install the switch in round hole or threaded hole racks, remove all rack plugs from rail kit, if required (described below), and attach all components with nuts and bolts that fit the rack.
The finished assembly for rack mounting the device is shown in Figure 3-3. Detailed mounting instructions for all rack types start from Section 3.2.3.1.
Figure 3-3: Switch Shelves Installed
Note The parts list for rack kit installations for round and threaded hole racks are listed in Appendix C.
3.2.1.1 Shelves
The two shelves are almost identical, differing in that 1) they are mirror-images of each other, and 2) the left shelf includes a stabilizer bar. Each shelf is a two-piece mechanism. The base includes the surface upon which the switch is placed and is oriented towards the front of the rack. The slide-end adjusts the shelf’s length for fitting the shelf between front and rear posts of various size racks.
Figure 3-4 displays the inner view of the left shelf. Depending on the rack kit ordered, each shelf may include latches to the locking mechanism that secures the shelf to the rack. If the locking mechanism is not present, the kit shall be attached with appropriate screws (not included). Figure 3-4 displays latches that are closed; the insets display open latches The inner side of each shelf is oriented toward the center of the rack.
Figure 3-4: Left Shelf – Inner View
 
1
Front post attachments
4
Rear post attachments
7
Stabilizer bar (left shelf only)
2
Front latch (closed)
5
Slide-end
8
Front latch (open)
3
Rear latch (closed)
6
Base
9
Rear latch (open)
Figure 3-5 displays the outside view of the right shelf, from where rack plugs and guide pins that insert into rack posts are visible (Insets A and B). To install shelves into posts with threaded or rounded holes, attach the shelves with bolts that fit the rack. Remove all plugs from the shelves if present.
Figure 3-5: Right Shelf – Outer View
 
1
Front post attachments (Inset A)
4
Rear post attachments (Inset B)
7
Inset B
2
Base
5
Inset A
8
Rack plugs
3
Slide-end
6
Rack plugs
   
3.2.1.2 Mounting Ears
Figure 3-6 displays the mounting ears, which secure the switch top to the rack. The two mounting ears are identical and installed above each shelf. The inner side of each ear may include a latch to the locking mechanism that secures the ear to the rack.
Rack posts and guide pins that insert into the rack are visible from the outer side of the ear (Inset B). To install ears into posts with threaded or round holes, remove both plugs from each ear (if required for rail set), then install the ears with screws that fit the rack.
Figure 3-6: Mounting Ears
 
1
Brace (Inner view)
4
Inset A - Released
7
Inset B (Details)
2
Inset A
5
Brace (Outer view)
8
Rack plugs
3
Inset A - Locked
6
Inset B
   
3.2.2 Component Placement
Figure 3-7 displays component placement for a 7304 (8-RU) switch. Mounting ears brace the top of the switch; their rack placement position differs for each switch model. Using the placement of the shelves’ bottom front rack plug as a reference (first RU and first hole), the mounting ears are placed as follows:
7304: 8th RU (22nd through 24th holes)
7308: 13th RU (37th through 39th holes)
7316: 21st RU (61st through 63rd holes)
Figure 3-7: Component Placement
3.2.3 Switch Mounting Process
The switch mounting process consists of three steps: 1) installing the shelves; 2) installing the mounting ears; and 3) placing and securing the switch upon the shelves.
3.2.3.1 Shelf Installation
The installation process for each shelf is identical. The shelves must be installed on the same horizontal level. In the following section, inner side illustrations feature the left shelf and outer side illustrations feature the right shelf.
Perform the following procedure for each shelf:
Step 1 If applicable, verify that both locking mechanism latches on the shelf are open ( Figure 3-5, insets A and B). Racks that do not require the locking mechanism, skip to step 2.
Step 2 Attach the front side of the shelf to its corresponding front rack post by inserting the shelf-side rack plugs and guide pins into post slots ( Figure 3-8).
The shelf ledge must be between the front posts. If the rack plugs were previously removed or not present, use bolts to attach the shelf to the rack, and skip to step 4.
Figure 3-8: Attaching the Right Shelf
 
1
Right front rack post
       
2
Right shelf
       
Step 3 Close the front locking mechanism latch ( Figure 3-5).
Step 4 Glide the slide-end to a position outside of its rear rack post ( Figure 3-9).
Figure 3-9: Adjusting the Right Shelf
 
1
Front left rack post
       
2
Front right rack post
       
3
Rear right rack post
       
Step 5 Attach the back-side of the shelf into the rear shelf by gliding the slide-end such that the rack plugs (if present) and guide pins are inserted into the rack post holes ( Figure 3-10).
The bottom rack plug must be inserted one RU (three rack holes) above the bottom rack plug on the front side of the shelf. If the locking mechanism and plugs are not used, fasten the back-side of the shelf to the rear shelf, and skip to step 6.
Figure 3-10: Seating the Left Shelf
Step 6 Close the rear locking mechanism latch if present ( Figure 3-5).
3.2.3.2 Mounting Ear Installation
The mounting ears attach the top of the switch to the rack posts. Their placement on the posts depend on the switch model ( Section 3.2.2).
The installation process for each mounting ear is identical. The inner side of the mounting ear (which includes the locking mechanism latch) is oriented between the front rack posts. Depending on the rack kit configuration, a locking mechanism may not be present. In the following section, all illustrations feature the right mounting ear.
Perform the following procedure for each mounting ear:
Step 1 Install the mounting ear on the front post by inserting the front rack plugs (if present) and guide pins in the racks specified for the switch model that is being installed ( Figure 3-11).
Figure 3-11: Attaching the Right Mounting Ear
 
1
Front right rack post
       
If rack plugs are not present, align the threaded holes and attach the mounting ears with screws.
Step 2 If applicable, close the front locking mechanism latch ( Figure 3-6).
3.2.3.3 Inserting the Switch into the Rack
Step 1 Rotate the stabilizer bar from the left shelf toward the right shelf such that the nob at the end of the stabilizer bar inserts into the notch at the rear of the ledge of the right shelf.
Figure 3-12: Both Switch Shelves Installed
Step 2 Move the chassis to the rack using a mechanical lift ( Figure 3-13-right). If modules are inserted in the chassis, use the lift carefully to avoid damaging any components.
Figure 3-13: Lifting the Switch Chassis
Step 3 Lift the chassis into the rack.
Step 4 Secure the chassis by tightening the six thumbscrews on the front flanges into the rack posts.
After completing the Four-Post Installation, proceed to Chapter 4.