CDS3 Frame Relay Port Adapters

This chapter describes the channelized DS3 Frame Relay port adapter (CDS3) that is supported in the following ATM systems:

• Catalyst 8540 MSR
  
  
• Catalyst 8510 MSR
  
  
• LightStream 1010
  
  
• Catalyst 5500
  
  

This chapter includes the following sections:

• About CDS3 Frame Relay Port Adapters
  
  
• Cabling CDS3 Frame Relay Port Adapters
  
  

About CDS3 Frame Relay Port Adapters

The Channelized DS3 Frame Relay port adapter (CDS3) is used for wide-area connectivity, to link multiple campuses, or to connect public networks. The CDS3 port adapter has one physical 44.736 Mbps port and consists of 28 T1 lines multiplexed through a T3 trunk. The CDS3 port adapter supports standard BNC coaxial cable connectors.

Interface Ports Supported

The ATM switch router supports any port adapter combination required. Table 15-1 identifies the number of CDS3 interface ports supported in each system.

Figure 15-1 shows a CDS3 port adapter with BNC connectors.

Figure 15-1: CDS3 Frame Relay Port Adapter with BNC Connectors

ATM Connections Supported

The CDS3 port adapter facilitates internetworking between a Frame Relay network, an ATM network, and network users. (See Figure 15-2.) Users can retain existing Frame Relay services and expand to a higher bandwidth capacity of an ATM network when required. The CDS3 port adapter is useful for service providers who provide Frame Relay services over a core ATM backbone.

Figure 15-2: CDS3 Frame Relay Port Adapter ATM WAN Connection

Cabling CDS3 Frame Relay Port Adapters

This section describes supported cabling configurations for the Channelized DS3
Frame Relay (CDS3) ATM port adapter.

Note   All interfaces are full duplex. You must use the appropriate interface 75-ohm coaxial cable to connect the CDS3 port adapter interface with an external network.

CDS3 Frame Relay Port Adapter Supported Interfaces

The CDS3 port adapter provides an interface to ATM switching fabrics for transmitting and receiving data at up to 45 Mbps (CDS3) bidirectionally. The ATM port adapter can support interfaces that connect to the CDS3 45-Mbps coaxial cable physical layer.

Note   See the "E1, CES E1, DS3, E3, and CDS3 Connections" section for ATM cabling requirements.

CDS3 Frame Relay Port Adapter Connectors

To connect the CDS3 port adapter to an external Frame Relay network, use a 75-ohm RG-59 coaxial cable with bayonet-style twist-lock (BNC) connectors. (See Figure 15-1.)

Caution   Connect the CDS3 ports to a network termination unit (NTU). NTU devices should comply with UL 1950, CSA 950, EN 60950, and IEC 950 standards.

Note   See the "E1, CES E1, DS3, E3, and CDS3 Connections" section for a description of these connectors.

CDS3 Frame Relay Port Adapter LEDs

The LEDs provide status information for the individual CDS3 interface connections. The LEDs are shown in Figure 15-3 and described in Table 15-2.

Figure 15-3: CDS3 Frame Relay BNC Connectors and LEDs