The Challenge
Comcast’s (formerly AT&T Broadband) drafting teams were designing HFC cable plant using AutoCAD Map, but the process was almost entirely manual. Designers hand-managed layers, manually placed and rotated blocks, entered attributes by memory, and had no way to validate network connectivity as they worked. Individual routines had been developed over the years to help, but they were inconsistent and fragmented – no standardized data capture, no enforced drafting standards, and no automated quality control. Every office worked differently, and drawing quality varied wildly.
Quality assurance was the biggest pain point. QA reviews were manual, error-prone, and expensive. Connectivity errors, missing attributes, non-standard symbols, and incorrect bus boundaries would make it into submitted drawings and corrupt downstream systems including the customer service database. There was no automated way to catch these problems before they caused damage.
The Work
LegacyX’s founder was a key developer of @MApp, a fully integrated application running inside AutoCAD Map that automated the entire drafting, design, and quality assurance workflow for HFC cable plant. This deep experience in geospatial engineering, AutoCAD customization, and large-scale operational tooling is part of the foundation LegacyX was built on.
When a designer placed a component – an amplifier, a tap, a terminator, @MApp automatically set the correct layer, created the block, rotated it to match the cable run, trimmed the cable, and maintained network connectivity in real time. Attribute data was captured through intuitive dialog boxes with required fields and auto-populated values drawn from the connectivity model, eliminating the missing data and inconsistencies that had plagued the manual process.
@MApp introduced a multi-level quality assurance system that could validate drawings at every stage of the design lifecycle, from initial draft through submitted, preliminary, approved, and final reviews. Each QA pass performed symbol validation, connectivity verification, and standards compliance checks. When errors were found, they were marked with locator arrows and descriptions so designers could navigate directly to each problem. Batch processing allowed hundreds of drawings to be checked consecutively, generating detailed error reports for each.
The connectivity model was the backbone of the system. By building intelligence into how cable, equipment, and network boundaries related to each other, the system could trace individual bus legs, colorize plant by bus assignment, automate bus boundary creation, validate network integrity, and detect connectivity errors that would have been invisible in a manual review. This same connectivity model powered automated address extraction, coordinate export, and data block generation – processes that had previously been entirely manual.
The final release added real-time HFC signal design and power level calculations directly into the drafting environment.
Why It Matters
@MApp standardized HFC cable plant design across Comcast’s operations, eliminated manual QA processes, enforced consistent data capture, and gave the organization an intelligent connectivity model that linked physical plant design to downstream systems. The application was adopted as a reference model by Autodesk and remains in production use today.
This engagement represents 15+ years of depth in GIS, AutoCAD customization, and geospatial driven operational workflows, expertise that carries directly into the work LegacyX delivers today.