Cisco NM-1A-OC3-POM OC-3 ATM Network Module

What It Is

The Cisco NM-1A-OC3-POM is a network module designed for integration into Cisco NM-series router platforms, providing ATM OC-3 connectivity. This module belongs to the NM (Network Module) family and is characterized by a single POM (Pluggable Optical Module) slot, which accepts SFP optics for fiber-optic uplinks. It is intended for enterprise WAN edge deployments requiring legacy ATM transport at OC-3 rates.

Technical Details

• Form Factor: Cisco NM (Network Module) series, compatible with supported Cisco routers.
• Interface: One ATM OC-3 port using a POM (SFP) slot for optical transceiver modules.
• Line Rate: OC-3 (155.52 Mbps) ATM over SONET/SDH.
• Connector Type: SFP (Small Form-factor Pluggable) slot, accepting supported optical modules.
• Protocol: ATM (Asynchronous Transfer Mode) with OC-3 framing.
• Model Number: NM-1A-OC3-POM (also referenced as NM-1A-OC3-POM= for spare ordering).
• Series: Cisco NM-series network modules.

Configuration & Options

• Single POM (SFP) slot for optical module installation; transceiver not included by default.
• Module is ordered as NM-1A-OC3-POM; a spare/orderable version is designated NM-1A-OC3-POM=.
• Requires a compatible SFP optical module for fiber type and distance (e.g., multimode or single-mode) — selection based on deployment needs.
• Supported on Cisco routers with NM slots; verify platform compatibility prior to integration.
• No additional onboard ports; dedicated to one OC-3 ATM connection.

Operating Conditions

This module is intended for installation in enterprise or service-provider edge routers where legacy ATM-over-SONET transport is still required for interconnection with existing infrastructure. It operates in controlled environments typical of telecommunication rooms or data centers, with ambient temperature and humidity within Cisco-specified ranges for NM modules. The single SFP slot allows field-configurable fiber connections, making it suitable for both short-reach intra-building links and longer metro connections depending on the optical module chosen.