PTCL Fibre in High-Rise Buildings and Apartments: The Telecom Room, Riser and Cabling Rules (Pakistan)
PTCL rules for fibre in high-rise buildings in Pakistan: a 4 x 4 x 8 ft telecom room, 4-inch entry pipe and riser, 2 fibres per flat, rack sizes, Cat 6 to 55 m.
PTCL publishes building guidelines for anyone constructing an apartment block, office tower or mall that wants fibre internet and TV. The main points: a locked main telecom room of about 4 x 4 x 8 feet, a 4-inch pipe from the building's entry box to that room, a small telecom room on every floor joined by a 4-inch riser, two labelled fibre cables for every flat, and Category 6 cable no longer than 55 metres inside each unit.
These rules matter before the plaster goes on. Once walls are closed, adding fibre means breaking ducts or running ugly cables along the outside of the building. A builder who follows PTCL's plan can offer Flash Fiber to every buyer on day one. A buyer can use the same list to ask a developer the right questions before booking a flat. The full specification is below, set out step by step.
PTCL's building requirements at a glance
| Part of the building | PTCL's requirement |
|---|---|
| Main telecom equipment room | About 4 x 4 x 8 feet (length x width x height), lockable, safe, with no drainage or seepage pipes passing through |
| Entry pipe | 4-inch pipe from the building's entry box to the main telecom room, with a 6 mm nylon rope inside, both ends sealed |
| Equipment rack | A fixing rack in the main room, sized by the number of floors |
| Each floor | A mini telecom room of about 2 x 2 feet |
| Riser | 4-inch riser joining every floor room to the main room |
| Fibre per unit | 2 single mode fibre cables for each flat, tenant or office, labelled with the unit number |
| Areas with more than 5 customers | One 8 fibre cable from the point of use to the main room, in place of the 2 fibre cables |
| Inside each unit | A 2 x 2 feet distribution panel box with an electrical socket |
| Cabling to each point | Category 6 Ethernet, no run longer than 55 metres, sockets and connectors wired to the 568B standard |
The main telecom room
Every building needs one main telecom equipment room. PTCL puts the size at about 4 feet long, 4 feet wide and 8 feet high. That is roughly a large cupboard, so it fits under a stairwell or beside the generator room.
PTCL asks for three things in that room:
- Sunlight exposure, safety features and a good lock, so only authorised staff can enter.
- No water pipes. Drainage and seepage pipes must not pass through it. One leak can take a whole building offline.
- An equipment fixing rack, sized to the building, as in the table below.
Rack size by building height
Racks are measured in "U", a rack unit of 1.75 inches of height. A bigger building needs more room for equipment.
| Building type | Rack size |
|---|---|
| Ground plus 4 (5 storeys) | 6U |
| Ground plus 5 to 10 (6 to 11 storeys) | 9U |
| Ground plus 11 to 20 (12 to 21 storeys) | 12U |
| Ground plus 20 and above | 18U |
| Commercial building or shopping mall | 42U |
How fibre reaches every flat, step by step
Follow PTCL's plan in this order during construction:
- Lay the entry pipe. Run a 4-inch pipe from the building's entry box to the main telecom room. Leave a 6 mm nylon rope inside it so PTCL's team can pull its cable through later. Seal both ends so no rubble gets in.
- Build the main room and rack. Use the size and rack table above.
- Add a mini telecom room on each floor. About 2 x 2 feet.
- Run the riser. A 4-inch riser joins each floor room to the main room.
- Lay fibre for each unit. Put 2 single mode fibre cables in the riser for every flat, tenant or office, and label each cable with its unit number. If an area has more than 5 customers, lay one 8 fibre cable from the point of use to the main room instead.
- Fit a distribution panel in each unit. A 2 x 2 feet box with a main electrical socket beside it, for the fibre router.
- Wire the rooms with Category 6. Lay Cat 6 Ethernet cable to every point where internet or TV is needed. Keep each run under 55 metres, and wire sockets and connectors to the 568B standard.
Single mode fibre is the thin glass fibre used for long distances and high speeds, the same kind used for fibre to the home. Labelling matters more than it sounds. Without labels, a technician cannot tell which of 200 cables belongs to flat 7B, and a connection that should take an hour can take a day.
Why these rules help buyers and tenants
For a flat buyer, a building wired to this plan means a fibre connection can be installed on request, without drilling through walls. Ask the developer three questions before you book:
- Is there a main telecom room, and where is it?
- Does each flat have its own labelled fibre in the riser?
- Is there a distribution box with a power socket inside the flat?
If the answers are no, expect a harder installation later, and a building where one shared connection is resold to every flat. That kind of Wi-Fi resale is illegal without a PTA licence, as our guide to checking if your internet provider is PTA licensed explains. Once the wiring is in place, compare PTCL Flash Fiber packages and prices for the flat, or our wider list of cheapest home internet packages in Pakistan.
Frequently asked questions
What size should the telecom room be in a building?
PTCL asks for a main telecom equipment room of about 4 x 4 x 8 feet, and a mini room of about 2 x 2 feet on each floor.
How many fibre cables does each flat need?
Two single mode fibre cables per flat, tenant or office, labelled with the unit number. Where an area has more than 5 customers, one 8 fibre cable replaces them.
What pipe size does PTCL need for the building entry?
A 4-inch pipe from the entry box to the main telecom room, with a 6 mm nylon rope inside and both ends sealed.
How long can a Cat 6 cable run be?
PTCL says no longer than 55 metres, because longer runs hurt service quality.
What rack does a 10 storey building need?
A ground plus 5 to 10 building, 6 to 11 storeys, needs a 9U rack under PTCL's table.
Who do I contact at PTCL about a new building?
Call 1218 or email care@ptcl.net.pk, the contacts PTCL lists on its guidelines page.
How we verified this
What we checked and where we read it.
All requirements come from PTCL's "Guidelines for High Rise Buildings" page, ptcl.com.pk, under Internet, read on 14 November 2026. The explanations of rack units and single mode fibre, and the buyer questions, are ours.
About the author
Technology Journalist & Multimedia Producer
Ahmad Ali is a technology journalist and multimedia producer at Pakistan Era, joining the team in October 2026. He covers consumer technology and digital life for Pakistani readers, combining research with hands-on product testing.
