Nortel NTHW26DG 02 2pOC3ChSmLrVsp4e 2-Port OC-3c/STM-1 Channelized ATM FP Card

The Nortel Networks NTHW26DG 02 (designated as 2pOC3ChSmLrVsp4e) is a 2-Port OC-3c/STM-1 Channelized ATM Functional Processor (FP) Card designed for the Nortel Passport MSS 15000 multiservice switching platform. It provides two independent channelized OC-3c/STM-1 (155.52 Mbps) ATM ports with single-mode long-reach (SmLr) optical interfaces, supporting both ATM cell switching and channelized TDM grooming capabilities.This line interface module combines high-performance ATM VP/VC switching, traffic management, and QoS features with channelized functionality, allowing efficient mapping of lower-speed circuits (such as T1/E1, VT1.5, or VC-12) into the OC-3/STM-1 payload. It is optimized for multiservice environments requiring converged ATM, voice, and data services with flexible grooming and interworking between TDM and packet domains. The "Vsp4e" designation indicates enhanced voice service processing capabilities.
The NTHW26DG features two single-mode fiber ports with SC duplex connectors and supports transmission distances up to 40 km over ITU-T G.652 single-mode fiber (SMF) using long-reach optics. This makes the card suitable for metro, regional, and longer intra-city ATM backbone or aggregation links. The card integrates directly with the Passport 15000 backplane and fabric modules for non-blocking cell forwarding and system-wide traffic engineering.
For installation and maintenance, the module occupies a dedicated line card slot in the Passport MSS 15000 chassis. It is a field-replaceable unit with robust backplane connectors. The card operates on standard -48 VDC telecom power and includes front-panel LEDs for per-port link status, activity, alarms, and module health. Proper fiber cleaning and inspection are essential to maintain optimal optical performance.
The card is engineered for carrier-class reliability in central office environments, complying with NEBS-level requirements for electromagnetic compatibility, thermal performance, and high availability. It supports redundant configurations and facilitates fault isolation through built-in diagnostics, loopback testing, and comprehensive system-level monitoring.
During operation, the NTHW26DG continuously monitors port status, ATM cell statistics, channelized traffic performance, and link quality on both ports, reporting alarms and performance data to the central control processor. Configuration, grooming, traffic engineering, and firmware updates are managed through the Passport Element Management System or CLI.
The Nortel Networks NTHW26DG 02 2pOC3ChSmLrVsp4e is intended for high-density channelized ATM deployments in the Passport 15000 platform, enabling cost-effective OC-3/STM-1 connectivity with grooming and enhanced voice processing capabilities over long-reach single-mode fiber infrastructure in metro and regional multiservice networks.