GLMZ's communications infrastructure is not a single network but a layered stack of competing and partially overlapping mesh systems, each maintained by a different corporate consortium. The Civic Mesh, administered by the Meridian Communications Compact, handles public-tier traffic. Helikon-Voss operates the HV-Secure private network for its employees and subsidiaries. Quorum Systems runs the QNet architecture, which covers approximately 34% of the city's physical territory through embedded relay nodes in Quorum-manufactured infrastructure hardware. Each network claims end-to-end encryption; each network has been successfully penetrated at various points. The business of signals intelligence in GLMZ is less about breaking encryption than about finding the physical and logical chokepoints where traffic is inevitably exposed.

The primary technique employed by corporate intelligence units is 'node squatting': the installation of passive capture hardware at mesh relay points in physical infrastructure. Relay nodes are embedded in street furniture, structural supports, utility junction housings, and the exteriors of commercial buildings throughout the city. Access to these nodes requires physical presence but not network credentials—the capture hardware operates entirely passively, recording encrypted traffic volumes, timing patterns, and handshake metadata. Even without decryption, traffic analysis at this level reveals communication patterns, organizational rhythms, and anomalous activity that constitute actionable intelligence. The infrastructure maintenance corridors of the Lakeshore Commercial Spine, a dense band of corporate towers running from the Civic Tier through the Mid-Tier Districts, are reportedly so saturated with competing surveillance hardware that security analysts privately refer to the area as 'the fishbowl.'

Decryption operations for intercepted traffic are conducted at dedicated secure facilities, typically located in corporate campuses outside the city's densest surveillance zones. The computational resources required for brute-force decryption of current-generation Meridian encryption are prohibitive for all but the largest actors; instead, intelligence units rely on obtaining cryptographic keys through human intelligence operations—bribery, coercion, or the insertion of technical personnel into the target organization's infrastructure team. Key theft operations targeting the Civic Mesh's rotating key infrastructure have been documented in three separate Civic Arbitration Board proceedings since 2179, with attribution in each case disputed.

A growing concern for all network operators is the proliferation of 'leech implants': modified neural interfaces carried by witting or unwitting individuals who act as mobile collection nodes. Leech implants passively capture and store ambient mesh traffic within their carrier's proximity, then upload collected data to a remote handler when the carrier enters a designated uplink zone—often a specific café, transit station, or public plaza. The carrier may have no knowledge of the implant's secondary function; installation can be accomplished during routine implant maintenance at compromised service centers. Three licensed implant maintenance clinics in the Irongate District were found to have installed leech firmware in clients' implants between 2180 and 2182, in what investigators believe was a coordinated operation by an unidentified corporate intelligence unit.