The CDS3 Frame Relay Port Adapter

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

Catalyst 8540 MSR
Catalyst 8510 MSR
Catalyst 5500
LightStream 1010

This chapter includes the following sections:

Overview of the CDS3 Frame Relay Port Adapter

The Channelized DS3 Frame Relay port adapter (CDS3) is used for wide-area connectivity, to link multiple campuses, or to connect to 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 supports any port adapter combination required. Table 14-1 identifies the number of CDS3 interface ports supported in each system.

Table 14-1: Maximum Interface Ports Supported by System Type

System Type Max. No. of CDS3 Interface Ports

Catalyst 8540 MSR

16

Catalyst 8510 MSR

8

Catalyst 5500

8

LightStream 1010

8

System Type	Max. No. of CDS3 Interface Ports
Catalyst 8540 MSR	16
Catalyst 8510 MSR	8
Catalyst 5500	8
LightStream 1010	8

Figure 14-1 shows a CDS3 port adapter with BNC connectors.

Figure 14-1: 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 14-2.) 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 14-2: CDS3 Frame Relay Port Adapter ATM WAN Connections

Cabling the CDS3 Frame Relay Port Adapter

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 For descriptions of ATM cabling requirements, see the "ATM Connection Equipment Requirements" section.

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 14-1.)

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

Note For a description of these connectors, see the "ATM Connection Equipment Requirements" section. (Figure 2-5 shows a coaxial interface cable with BNC connectors.)

CDS3 Frame Relay Port Adapter LEDs

The LEDs provide status information for the individual CDS3 interface connections. The LEDs are shown in Figure 14-3 and described in Table 14-2.

Figure 14-3: CDS3 Frame Relay BNC Connectors and LEDs

Table 14-2: CDS3 Frame Relay Adapter LED Descriptions

LED State Description

CD (carrier detect)

Off
Green

Carrier detect signal not received
Carrier detect signal received

RX (receive)

Off
Flashing green
Red

LOS¹ or shutdown
Cells being received
Alarm (LOF², LCD³, AIS⁴)

TX (transmit)

Off
Flashing green
Steady yellow

No transmit line activity
Cells being transmitted
Alarm FERF⁵

¹LOS = loss of signal
²LOF = loss of frame
³LCD = loss of cell delineation
⁴AIS = alarm indication signal
⁵FERF = far-end receive failure

LED	State	Description
CD (carrier detect)	Off Green	Carrier detect signal not received Carrier detect signal received
RX (receive)	Off Flashing green Red	LOS¹ or shutdown Cells being received Alarm (LOF², LCD³, AIS⁴)
TX (transmit)	Off Flashing green Steady yellow	No transmit line activity Cells being transmitted Alarm FERF⁵

Table of Contents

The CDS3 Frame Relay Port Adapter