The DS3 and E3 Port Adapters

This chapter describes the DS3 and E3 port adapters that are supported in the following systems:

Catalyst 8540 MSR
Catalyst 8510 MSR
Catalyst 5500
LightStream 1010

This chapter includes the following sections:

Overview of the DS3 and E3 Port Adapters

The DS3 and E3 port adapters are used for wide-area connectivity, to link multiple campuses, or to connect to public networks. The DS3 and E3 port adapters support standard BNC coaxial cable connectors.

Interface Ports Supported

The ATM switch supports any port adapter combination required. Table 11-1 identifies the maximum number of DS3 or E3 interface ports supported in each system.

Table 11-1: Maximum Interface Ports Supported by System Type
System Type Maximum Number of DS3 or E3 Interface Ports

Catalyst 8540 MSR

64

Catalyst 8510 MSR

32

Catalyst 5500

32

LightStream 1010

32

Table 11-1: **Maximum Interface Ports Supported by System Type**
System Type	Maximum Number of DS3 or E3 Interface Ports
Catalyst 8540 MSR	64
Catalyst 8510 MSR	32
Catalyst 5500	32
LightStream 1010	32

Figure 11-1 shows a DS3 port adapter with BNC connectors.

Figure 11-1: DS3 Port Adapter with BNC Connectors

ATM Connections Supported

The DS3 and E3 port adapters can provide intercampus and enterprise WAN connections, as shown in Figure 11-2 .

Figure 11-2: DS3 Port Adapter ATM Intercampus and WAN Connections

The DS3 can also be used to link a router at a customer site to a central office, as shown in Figure 11-3.

Figure 11-3: DS3 Port Adapter ATM Customer-Site-to-Central-Office Connection

The DS3 can also be used to link an ATM switch at a customer site to a central office via a virtual path tunnel, as shown in Figure 11-4.

Figure 11-4: DS3 Port Adapter ATM with Virtual Path Tunnel Connection

Note If your connections include a virtual path tunnel, the FC-3 must be included in the configuration.

Regulatory Approvals

The DS3 port adapter meets Japan Approvals Institute for Telecommunications Equipment (JATE) approval. See Table 11-2 for JATE approval details for the DS3 port adapter.

Applicant Name	Model Number	Approval Number	Date of Approval
Nihon Cisco Systems	WAI-T1-4BNC, WAI-T1C-4BNC	N97-K021-0	April 30, 1997
Nihon Cisco Systems	C85MS-IDS3-FRBNC	N98-N343-0	October 21, 1998

Table 11-2: JATE Approval for the DS3 Port Adapter

Applicant Name Model Number Approval Number Date of Approval

Nihon Cisco Systems

WAI-T1-4BNC,
WAI-T1C-4BNC

N97-K021-0

April 30, 1997

Nihon Cisco Systems

C85MS-IDS3-FRBNC

N98-N343-0

October 21, 1998

Cabling the DS3 and E3 Port Adapters

This section describes supported cabling configurations for the DS3 and E3 port adapters.

Note All ATM interfaces are full duplex. You must use the appropriate ATM interface cable to connect the ATM DS3 or E3 port adapter interface with an external ATM network.

DS3 and E3 Port Adapter Supported Interfaces

The DS3 and E3 port adapters provide an interface to ATM switching fabrics for transmitting and receiving data at up to 45 Mbps (DS3) or 34 Mbps (E3) bidirectionally. The ATM port adapter can support interfaces that connect to the following physical layers:

DS3 45-Mbps coaxial cable
E3 34-Mbps coaxial cable

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

DS3 and E3 Port Adapter Connectors

To connect the DS3 port adapter and E3 port adapter to an external ATM network, use a 75-ohm RG-59 coaxial cable with bayonet-style twist-lock (BNC) connectors .
(See Figure 11-5.)

Caution
The DS3 and E3 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 2-4 shows a coaxial interface cable with BNC connectors.)

Figure 11-5: DS3 and E3 Coaxial Connections and LEDs

DS3 and E3 Port Adapter LEDs

The LEDs provide status information for the individual DS3 and E3 interface connections. The LEDs are described in Table 11-3 and shown in Figure 11-5.

Table 11-3: DS3 and E3 Port Adapter LED Descriptions
LED Description

CD (carrier detect)

Off---Carrier detect signal not received
Green---Carrier detect signal received

RX (receive)

Off---LOS¹ or shutdown
Flashing green---Cells being received
Red---Alarm (LOF², LCD³, AIS⁴)

TX (transmit)

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

Table of Contents

The DS3 and E3 Port Adapters