Taiwan Penghu Kinmen Matsu No.2 (TPKM2): Regional connectivity within Taiwan
The Taiwan Penghu Kinmen Matsu No.2 (TPKM2) submarine cable is a domestic telecommunications system connecting multiple islands and regions within Taiwan, including
Budai,
Dongyin,
Huxi Township,
Jinhu Township,
Tanshui, and
Yuanli. Owned by Chunghwa Telecom, it plays a role in linking Taiwan's main island to its outlying territories, such as Penghu, Kinmen, and Matsu. With a recorded ready-for-service (RFS) date of 2000, the cable is listed as in service, although details about its design capacity, fiber pairs, supplier, and technology are not publicly disclosed.
What stands out about TPKM2 is its strategic importance in providing redundancy and connectivity for Taiwan's island regions. While its design and operational specifics remain opaque, its role in a network of domestic cables, including the
Taiwan Penghu Kinmen Matsu No.3 (TPKM3) and
Taiwan-Matsu No.4, highlights its integration into a broader system. Additionally, its landing points at Tanshui connect it to international cables, such as
APCN-2 and
FASTER, which extend Taiwan's global reach.
Quick facts
| Name | Taiwan Penghu Kinmen Matsu No.2 (TPKM2) |
| Length | 467 km |
| Ready-for-service (RFS) year | 2000 (GeoCables database value) |
| Owner | Chunghwa Telecom |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Budai, Dongyin, Huxi Township, Jinhu Township, Tanshui, Yuanli |
Route
TPKM2 connects six landing points within Taiwan: Budai, Dongyin, Huxi Township, Jinhu Township, Tanshui, and Yuanli. These locations span Taiwan's main island, as well as its outlying islands in the Penghu, Kinmen, and Matsu archipelagos. Dongyin and Huxi Township are particularly notable for hosting multiple cables, including Taiwan-Matsu No.4 and Taiwan Penghu Kinmen Matsu No.3 (TPKM3). Tanshui, a critical landing point near Taipei, serves as a hub for international connectivity, linking Taiwan to global submarine cable systems such as APCN-2, FASTER, and the
Southeast Asia-Japan Cable 2 (SJC2).
Why it was built and what it carries
TPKM2 was constructed to enhance domestic telecommunications within Taiwan, ensuring reliable connectivity between its islands and the mainland. This cable likely supports voice, data, and internet traffic for residential, commercial, and government users. Its integration into Chunghwa Telecom's network suggests a focus on redundancy and resilience, particularly for regions prone to natural disasters like typhoons and earthquakes.
History: what can be established
The GeoCables database lists TPKM2's ready-for-service year as 2000. No conflicting dates have been identified in other industry sources, but the absence of detailed documentation about its commissioning leaves room for uncertainty. It is part of a family of cables that includes TPKM3, indicating a phased approach to building Taiwan's domestic cable infrastructure.
Capacity and technology
Publicly available information does not disclose TPKM2's design capacity, fiber pair count, supplier, or specific technological features. Without operator documentation, it cannot be stated whether TPKM2 employs modern wavelength-division multiplexing (WDM) or other advanced technologies. Given its age, upgrades may have been implemented, but this remains speculative.
Latency: the physics
The theoretical latency for light propagation over TPKM2's 467 km wet segment is approximately 2.3 ms one-way or 4.6 ms round-trip. This calculation assumes optimal conditions, with light traveling at 200,000 to 204,000 km/s in fiber. Real-world latency is higher due to additional factors, such as signal processing at terminals, routing delays, and land-based network segments.
Live measurements from remote probes, which capture the full internet path rather than the cable alone, show significantly higher round-trip times to Huxi Township. For instance:
- Singapore -> Huxi Township: 53.3 ms
- Sydney -> Huxi Township: 146.9 ms
- Sao Paulo -> Huxi Township: 304.5 ms
These figures reflect broader network dynamics, including routing through multiple cables and terrestrial systems.
Redundancy: what happens if it breaks
In the event of a TPKM2 outage, redundancy is provided by other cables in the corridor, such as Taiwan Penghu Kinmen Matsu No.3 (TPKM3) and Taiwan-Matsu No.4. Tanshui's connectivity to international systems like APCN-2 and FASTER further ensures resilience for Taiwan's communications network. Repairs to submarine cables typically involve specialized vessels and can be delayed by weather conditions or geopolitical factors.
Bottom line
- TPKM2 is a domestic submarine cable connecting Taiwan's main island to its outlying territories.
- Owned by Chunghwa Telecom, it has been in service since 2000, according to GeoCables records.
- Details about its capacity, fiber pairs, supplier, and technology are not publicly disclosed.
- Its theoretical latency is approximately 4.6 ms round-trip over the wet segment, but real-world measurements are higher.
- Redundancy is supported by other cables in the corridor, including TPKM3 and Taiwan-Matsu No.4.