How to add a Serial DCE connection.

 Method 1: If you are using a Cisco 1941 Router (most common)

Step 1: Add two routers

  • Open Packet Tracer.

  • Go to Network Devices → Routers.

  • Drag 2 Cisco 1941 routers onto the workspace.

Step 2: Turn off each router

  1. Click the first router.

  2. Click the Physical tab.

  3. On the left, you'll see the router hardware.

  4. Click the power switch (bottom-left) to turn it Off.

Step 3: Install a serial module

On the left side, you'll see available modules.

Look for:

HWIC-2T

Drag HWIC-2T into one of the empty slots on the router.

Repeat the same process for the second router.

Step 4: Turn the routers back on

Click the power switch again to turn each router On.

Now close the router window.

Step 5: Connect the routers

  1. Click the Connections tool (⚡ lightning bolt) at the bottom.

  2. Select Serial DCE (the cable with a small clock icon).

  3. Click the first router.

  4. Select Serial0/0/0.

  5. Click the second router.

  6. Select Serial0/0/0.

The routers are now connected.

Step 6: Configure the DCE router

Open the CLI of one router:

enable
configure terminal
interface serial0/0/0
clock rate 64000
no shutdown

Configure the other router:

enable
configure terminal
interface serial0/0/0
no shutdown

How do I know which router is DCE?

After connecting:

  1. Open the router CLI.

  2. Type:

show controllers serial 0/0/0

If you see:

DCE V.35

then that router is the DCE end, and only that router should have the clock rate command.

If you cannot find the HWIC-2T module

Tell me:

  1. Which router model are you using? (For example: 1941, 1841, 2811, 2911, etc.)

  2. Which version of Cisco Packet Tracer are you using?

Or send me a screenshot of the Physical tab after clicking your router, and I'll point out exactly where to click.

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