CNX-5 Configurations

The CNX-5 system is available in T1 IMA and DS3 configurations that provide the flexibility to utilize existing backhaul facilities and meet growing DSL demand. Both configurations use Enhanced Channels Units (ECUs) and are managed by the CatenaView EMS. The table below summarizes the cards and their functions, applicable to each configuration.

Configurations
Card	Function
T1 IMA
ECU	Subscriber service card; 2 lines of POTS and ADSL
ECTU	ATM Fabric and T1 IMA network interface card; one per channel bank
DS3
ECU	Subscriber service cards; 2 lines of POTS and ADSL
Fiber ECTU	ATM fabric and fiber node; one per dual channel bank
DS3 WAN Cad	ATM fabric. traffice management and DS3 network interface card

Enhanced Channel Unit (ECU)
The ECU is a CNX-5 Subscriber Service Card, employing Ciena’s industry-leading integrated POTS+ADSL line interface technology. The ECU replaces the legacy POTS channel unit to provide two standards compliant ports of POTS+ADSL. When inserted into the SLC-5 chassis, the ECU operates as a regular SLC-5 POTS channel unit, complying with relevant TR-57 voice standards. To the service technician, the ECU installs the same way as a regular SLC-5 channel unit with familiar LED indications. For DSL services, the ECU complies with T1.413 (Issue 2), G.992.1 (G.dmt) and G.994.1, (G.handshake) ADSL standards, and is provisioned the same way as typical DSL services from a DSLAM.

Enhanced Channel Test Unit (ECTU) for the T1 IMA Configuration
To support DSL services on the SLC-5, the legacy Channel Test Unit (CTU) is replaced with Ciena’s ECTU. The ECTU retains the legacy CTU functionality and adds DSLAM capabilities to the SLC-5. The CNX-5 utilizes existing system resources on the SLC-5 to communicate between ECU cards and the ECTU. This innovative architecture simplifies DSL deployment by eliminating the need for POTS splitters and external cabling. In the event of an AC power failure, the ECTU can disable DSL to preserve power for POTS services. Upon restoration of AC power, the system will automatically re-enable DSL service.

DS3 WAN Card and Fiber Enhanced Channel Test Unit (Fiber ECTU) for the DS3 Configuration
The DS3 WAN Card and Fiber ECTU are companion cards in the CNX-5 DS3 configuration, which control all ATM switching and traffic management. Together, the cards aggregate traffic from multiple CNX-5s and provide a DS3 network interface. One Fiber ECTU is inserted into each dual channel bank, and a single DS3 WAN card provides the DS3 network interface for the multiple CNX-5s. The DS3 WAN card acts as the system manager, monitoring the integrity of the interconnections and managing the overall ATM traffic. In addition, the DS3 WAN card monitors for loss of AC power and can disable DSL service, as required, to preserve lifeline POTS service.

This simple, integrated approach permits service providers to aggregate multiple CNX-5s and respond to increased demand for DSL service.

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