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During a Hong Kong office move or fit-out, low-voltage and network work is increasingly treated as part of the renovation, handled by the interior designer or fit-out contractor. On the surface, pulling cable looks like the same site work as opening, concealing and making good. But this has turned a technical IT discipline into something that looks like it only needs someone who can drill, trunk and pull cable. This article explains the real difference, and why network engineering belongs with a specialist.
Why low-voltage work drifted to fit-out contractors
The reason is practical. When an office moves or is renovated, low-voltage, power, air-conditioning, ceilings and furniture are usually tendered together. To reduce interfaces, owners and designers fold "drilling, containment and cabling" into the fit-out package, and the contractor either handles it or subcontracts it.
The problem is that a contractor can deliver the physical layer — cable from the comms room to every desk, into trunking, with faceplates made good — but the part of network engineering that carries the value is not in that step. When the whole project goes to one company, design, configuration, testing and documentation are often skipped, and the result is an office that "has internet" rather than a network that is manageable, expandable and secure.
Cabling is the last 5%; configuration is the point
Low-voltage work splits into the physical layer (cable, faceplates, racks) and the logical layer (switching, routing, security, wireless). The physical layer follows standard methods; the logical layer is what decides whether the network works well.
Firewall: plugging it in is not security
A firewall without deliberate configuration is barely better than no firewall. A specialist plans internal and external zones, NAT, VPN remote access, traffic logging and intrusion prevention, and writes every rule into the documentation. The "convenient" setup of open ports or allow-everything is exactly how data leaks and ransomware get in.
VLAN: separate staff, guests, surveillance and IoT
VLANs segment the network. Staff, guest Wi-Fi, cameras, access control and IoT devices should each sit in their own segment, unable to reach each other. A guest with the Wi-Fi password should never touch internal servers, NAS or printers. Without VLANs, one compromised device can move freely across the internal network. Many Hong Kong offices that "have internet" are missing exactly this step.
QoS: meetings should not stall when a colleague uploads a file
Bandwidth is finite. QoS prioritises video conferencing, VoIP and critical traffic, so one large upload does not drag down the whole office.
AP placement and orientation matter more than "add more APs"
The most common wireless myth is "it is slow, so add APs". Placement, orientation and density often matter more than count.
- Antenna pattern: a ceiling AP radiates downwards and should be mounted flat; upright or on a wall, it points the signal the wrong way.
- Environment: high ceilings, metal structures, glazing, large furniture and thick walls change coverage, so a rough per-area rule does not hold.
- Roaming: as staff walk around with laptops and phones, devices hand off between APs. Insufficient overlap or poor settings produce the familiar "signal is there but the internet drops".
- Count comes from testing: AP count and positions should be set by an on-site coverage test (a dBm heat map) and documented in a report.
This takes tools and experience a cabling crew cannot deliver by feel.
The documentation is the real deliverable
After a job, the most valuable output is usually not the hardware but the records. A complete handover includes:
- Cable test reports
- Wi-Fi coverage heat map
- Rack and port schedule
- VLAN/subnet allocation table
- Firewall and configuration list
- As-built drawings
With these, future adds, moves, changes and fault-finding have a reference. Without them, every change means re-tracing cable, sometimes by opening up the fit-out.
This is not a "deal with it later" item. If the network fails, a critical device dies, or someone new takes over and there is no documentation, you rebuild from scratch — re-trace every cable and reconstruct the firewall and VLAN configuration. That costs at least several working days to recover. Can your business afford to stop for a few days?
How GNS differs from a cabling or fit-out company
GNS is a systems integrator (SI), with design through operations handled by its own engineering team:
- Design first: from the floor plan we mark AP positions, cable routes, rack location and subnets before any work starts.
- Configuration and security: firewall, VLAN, QoS, guest network and VPN are configured by engineers and written into the documents.
- Testing and acceptance: cable tests, Wi-Fi coverage tests and roaming tests, delivered as reports rather than verbal promises.
- 24/7 support: after completion, optional 24/7 managed support, or GNS CARE, which reads device telemetry through official APIs to predict failures.
- Verifiable record: GNS is a GITP supplier, accepts government P-Card, holds multiple ISO certifications, and has government, public body and railway delivery history.
For equipment, GNS is a registered Ubiquiti reseller; see hkunifi.com/solutions/ for UniFi solutions, with hardware, installation and managed service handled in one place.
Use a specialist; do not let a fit-out contractor be the guinea pig
If you are planning an office, or you run an interior design firm that needs someone to own the low-voltage and network scope, the cleanest approach is to split the work: the fit-out contractor handles building and decoration, and a network specialist owns design, installation, configuration, testing and documentation.
Ask five questions before signing:
- Who owns the design, and is there an AP and cabling plan on the floor plan first?
- Who configures the firewall, VLANs and guest network?
- How are AP count and positions decided, and will there be a coverage test?
- What documents are handed over — test reports and as-built drawings included?
- How are maintenance and follow-up support structured?
Companies with vague answers usually deliver cabling, not a network.
GNS provides end-to-end office network and low-voltage engineering — free site survey, itemised quotation, night works, testing, as-built handover and long-term support. Whether you are a business or an interior design firm looking for a reliable partner to take the low-voltage and network scope, contact GNS to talk.