Interactive router modes in PCB Design - Real Business Scenario

Scenario Mode

👤 Your Role: You are a PCB design engineer working on a new circuit board layout.

📋 Request: Your manager wants you to analyze the efficiency and accuracy of different interactive router modes used in PCB design software to improve routing productivity.

📊 Data: You have data from recent PCB projects showing the time taken, number of errors, and number of manual adjustments for three interactive router modes: 'Walkaround', 'Push and Shove', and 'Glossing'.

🎯 Deliverable: Create a dashboard report comparing these three router modes by average routing time, error count, and manual adjustments to recommend the best mode for future projects.

Sample Data

Project ID	Router Mode	Routing Time (min)	Error Count	Manual Adjustments
101	Walkaround	45	3	10
102	Push and Shove	30	1	5
103	Glossing	25	2	7
104	Walkaround	50	4	12
105	Push and Shove	28	1	4
106	Glossing	27	3	6
107	Walkaround	48	2	11
108	Push and Shove	32	2	6
109	Glossing	26	1	5

1

Step 1: Load the sample data into your BI tool with columns: Project ID, Router Mode, Routing Time (min), Error Count, Manual Adjustments.

Import the data table as is.

Expected Result

Data table with 9 rows and 5 columns loaded.

2

Step 2: Create a measure to calculate the average routing time per router mode.

Average Routing Time = AVERAGE('Data'[Routing Time (min)]) grouped by 'Router Mode'

Expected Result

Average routing times: Walkaround=47.67, Push and Shove=30, Glossing=26

3

Step 3: Create a measure to calculate the average error count per router mode.

Average Error Count = AVERAGE('Data'[Error Count]) grouped by 'Router Mode'

Expected Result

Average error counts: Walkaround=3, Push and Shove=1.33, Glossing=2

4

Step 4: Create a measure to calculate the average manual adjustments per router mode.

Average Manual Adjustments = AVERAGE('Data'[Manual Adjustments]) grouped by 'Router Mode'

Expected Result

Average manual adjustments: Walkaround=11, Push and Shove=5, Glossing=6

5

Step 5: Build a dashboard with a bar chart showing average routing time by router mode, a bar chart for average error count, and a bar chart for average manual adjustments.

Configure three bar charts with 'Router Mode' on X-axis and respective averages on Y-axis.

Expected Result

Dashboard with three clear bar charts comparing the three router modes.

6

Step 6: Add a summary table listing router modes with their average routing time, error count, and manual adjustments side by side.

Create a table visual with columns: Router Mode, Average Routing Time, Average Error Count, Average Manual Adjustments.

Expected Result

Summary table showing all three metrics per router mode.

7

Step 7: Interpret the dashboard to identify which router mode offers the best balance of speed and accuracy.

Review the charts and table to compare values.

Expected Result

Glossing mode has the lowest average routing time (26), Push and Shove has the lowest error count (1.33) and manual adjustments (5), offering the best balance.

Final Result

Bar Chart 1: Avg Routing Time

↓

Bar Chart 2: Avg Error Count

↓

Bar Chart 3: Avg Manual Adjustments

✓Glossing mode is the fastest with an average routing time of 26 minutes.

✓Push and Shove mode has the lowest average error count (1.33) among the three modes.

✓Push and Shove mode requires fewer manual adjustments (average 5) compared to Walkaround and Glossing.

✓Walkaround mode is the slowest and has the highest error count and manual adjustments.

✓Glossing mode is faster than Walkaround but has a slightly higher error count than Push and Shove.

Bonus Challenge

Add a time trend line chart showing how routing time changes over projects for each router mode to identify learning or efficiency improvements.

Show Hint

Use Project ID as the X-axis and Routing Time as the Y-axis, with separate lines for each Router Mode.

Practice

1.

What is the main purpose of interactive router modes in PCB design?

easy

A. To help draw PCB paths easily and correctly

B. To create 3D models of the PCB

C. To simulate electrical signals

D. To generate manufacturing reports

Solution

1. Step 1: Understand the role of interactive router modes

   Interactive router modes assist in drawing PCB paths by guiding the placement of traces.

2. Step 2: Compare with other PCB design tasks

   Creating 3D models, simulating signals, and generating reports are different functions not related to routing modes.

3. Final Answer:

   To help draw PCB paths easily and correctly -> Option A

4. Quick Check:

   Interactive router modes = Easy, correct PCB path drawing [OK]

Hint: Focus on routing tasks, not modeling or simulation [OK]

Common Mistakes:

• Confusing routing with 3D modeling
• Thinking routing modes simulate signals
• Assuming routing modes generate reports

2.

Which of the following is the correct syntax to activate the push-and-shove interactive router mode in a PCB design software command line?

router.mode = ?

easy

A. "pushshove"

B. "push-and-shove"

C. "push_and_shove"

D. "push and shove"

Solution

1. Step 1: Identify the correct mode name format

   Interactive router modes typically use hyphens to separate words, so "push-and-shove" is standard.

2. Step 2: Check other options for syntax errors

   Underscores or spaces are usually invalid in mode names; concatenated words without separators are uncommon.

3. Final Answer:

   "push-and-shove" -> Option B

4. Quick Check:

   Correct mode syntax uses hyphens [OK]

Hint: Use hyphens, not spaces or underscores in mode names [OK]

Common Mistakes:

• Using underscores instead of hyphens
• Including spaces in mode names
• Combining words without separators

3.

Given the following interactive router mode settings in a PCB design tool:

mode = "hug"
trace_width = 0.25
obstacle_spacing = 0.2

What is the expected behavior when routing near obstacles?

medium

A. The trace will automatically increase width near obstacles

B. The trace will ignore obstacles and route straight

C. The trace will push obstacles aside to make room

D. The trace will tightly follow the obstacle edges maintaining minimum spacing

Solution

1. Step 1: Understand the 'hug' mode behavior

   In 'hug' mode, the router closely follows obstacle edges while respecting spacing rules.

2. Step 2: Compare with other modes

   'Push-and-shove' moves obstacles, straight routing ignores obstacles, and width increase is unrelated here.

3. Final Answer:

   The trace will tightly follow the obstacle edges maintaining minimum spacing -> Option D

4. Quick Check:

   Hug mode = trace hugs obstacles [OK]

Hint: Hug mode means trace follows obstacles closely [OK]

Common Mistakes:

• Confusing hug with push-and-shove mode
• Assuming trace ignores obstacles
• Thinking trace width changes automatically

4.

In a PCB design tool, a user tries to activate the interactive router mode with the command:

router.setMode(push and shove)

What is the error in this command?

medium

A. Missing quotes around the mode name

B. Incorrect method name; should be set_mode

C. Mode name should be uppercase

D. No error; command is correct

Solution

1. Step 1: Check syntax for string arguments

   Mode names must be strings, so they require quotes around them.

2. Step 2: Verify method name and casing

   Method name 'setMode' is plausible; mode names are usually lowercase and hyphenated, but main error is missing quotes.

3. Final Answer:

   Missing quotes around the mode name -> Option A

4. Quick Check:

   String arguments need quotes [OK]

Hint: Always quote string mode names in commands [OK]

Common Mistakes:

• Forgetting quotes around strings
• Changing method names unnecessarily
• Using uppercase mode names

5.

You want to route a complex PCB with many tight spaces and obstacles. Which interactive router mode should you choose to automatically adjust traces and move obstacles to optimize routing paths?

hard

A. Hug mode

B. Simple mode

C. Push-and-shove mode

D. Manual mode

Solution

1. Step 1: Understand mode capabilities for complex routing

   Push-and-shove mode can move obstacles to make room for traces, ideal for tight spaces.

2. Step 2: Compare with other modes

   Simple mode does not adjust obstacles, hug mode follows edges tightly, manual mode requires user control.

3. Final Answer:

   Push-and-shove mode -> Option C

4. Quick Check:

   Push-and-shove moves obstacles for tight routing [OK]

Hint: Choose push-and-shove to move obstacles automatically [OK]

Common Mistakes:

• Selecting hug mode for obstacle movement
• Assuming simple mode adjusts obstacles
• Confusing manual mode with automatic routing