Nortel NTCA30CK OC-48/STM-16 T/R Short Reach

The Nortel Networks NTCA30CK is an OC-48/STM-16 tributary transceiver module designed for use in Nortel optical transmission platforms, including the Optera and other SDH/SONET multiplexers. It provides a single bidirectional short-reach optical interface operating at the nominal line rate of 2.488 Gbit/s (OC-48/STM-16). The module integrates both transmitter and receiver functions (T/R) and is optimized for intra-office or short-distance connections within central offices or between co-located equipment.The optical interface uses a 1310 nm Fabry-Perot (FP) laser transmitter compliant with SONET OC-48 SR (Short Reach) and SDH STM-16 I-16 specifications. It supports transmission over single-mode fiber (SMF, 9/125 µm) with a typical reach of up to 2 km. The receiver section employs a PIN photodiode for high sensitivity and low noise performance. The module features standard SC or LC optical connectors (depending on the specific platform variant) and meets low jitter and high extinction ratio requirements for reliable high-speed transport.
This transceiver card handles framed OC-48/STM-16 signals, supporting concatenated payloads (STS-48c / VC-4-16c) as well as lower-order mappings when used in conjunction with appropriate cross-connect and mapping functions in the host shelf. It is fully compatible with SONET and SDH framing structures, including section, line, and path overhead processing as implemented in the Nortel system. The NTCA30CK is designed as a plug-in unit for Nortel subracks, occupying a dedicated slot and interfacing with the backplane for electrical signal conversion, clocking, and management communication.
Key operational features include automatic laser shutdown (ALS) for eye safety, loss-of-signal (LOS) detection, and performance monitoring capabilities such as BIP-8 error checking, signal degrade, and signal fail thresholds. The module reports alarms and status information to the shelf controller via the system management bus, enabling centralized fault isolation and performance management through the network element management system.
Power supply is derived from the shelf backplane, typically -48 V DC, with low power consumption suitable for high-density deployments. The unit is engineered for carrier-class reliability with a high mean time between failures (MTBF) and supports hot-swappable replacement in redundant configurations where applicable. Environmental specifications follow standard telecom requirements: operating temperature range of 0°C to +55°C (or wider depending on platform), with humidity tolerance up to 95% non-condensing. It includes built-in surge and ESD protection to ensure stable operation in telecom environments.
The NTCA30CK is primarily used for short-reach interconnections between optical add-drop multiplexers (OADM), terminal multiplexers, or as a tributary interface for grooming lower-rate services (OC-3/STM-1, OC-12/STM-4, etc.) into the high-speed OC-48/STM-16 backbone. It enables efficient bandwidth utilization in metro and core transport networks while maintaining compatibility with existing Nortel SDH/SONET infrastructure. The short-reach optics reduce cost and complexity for intra-facility links compared to intermediate-reach (IR) or long-reach (LR) variants.
Installation requires proper fiber cleaning and adherence to minimum bend radius guidelines. The module supports remote provisioning and monitoring, with firmware compatibility managed through the host platform software releases. It is intended for telecommunications operators deploying or maintaining legacy Nortel optical transport systems. Proper grounding and compliance with laser safety standards (Class 1) are mandatory during operation and maintenance.
This transceiver board provides a cost-effective solution for reliable 2.5 Gbit/s optical transport over short distances, ensuring seamless integration within Nortel’s multi-service transmission platforms.