Cisco Line Cards

Cisco 7300 Two-Port OC-3 ATM Line Card

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Data Sheet

Product Overview

The Cisco® 7304 2-Port OC-3/STM-1 ATM Line Card (Figure 1) is a versatile, high-performance line card that is well suited for a variety of applications. These applications include high-speed WAN uplinks in customer premises equipment (CPE) deployments, high-speed enterprise backbones, and high-speed uplinks for deploying the Cisco 7304 Router as a medium-density, medium-speed, edge-aggregation router in Tier 2 and 3 service provider points of presence (POPs).

Developed for customers that need a combination of performance and deployment flexibility, the Cisco 7304 Router meets current and future requirements for a midrange router. The Cisco 7304 Router delivers high-performance forwarding and hardware-accelerated services in a compact four-rack-unit (4-RU), four-interface slot form factor.

Figure 1

Cisco 7304 2-Port OC-3 ATM Line Card
Powerful and flexible, the Cisco 7304 Router provides multiprotocol support, interface granularity, and high-availability features in a platform that is ideal for deployment in various applications such as high-end enterprise routing, medium-speed and medium-density leased-line aggregation in service provider Tier 2 and 3 POPs, and service provider-managed CPE deployments. Providing WAN connectivity at speeds ranging from DS3 through OC-48/STM-16, and LAN connectivity at speeds up to Gigabit Ethernet (using two 1000 Ethernet ports built into the Cisco NSE-100 route processor), the Cisco 7304 Router supports a wide range of concurrently running applications and lives up to the high standards of the Cisco 7000 Series of midrange routers.
Table 1 lists the features and benefits of the Cisco 7304 2-Port OC-3 ATM Line Card.

Table 1. Features and Benefits



Two ports of OC-3 ATM per line card

Enables connectivity options for both enterprise and service provider customers

Up to 155.52 Mbps per port

Provides high-performance routing and connectivity

Online Insertion and Removal (OIR)

Allows for insertion of the card without rebooting the router

Multiprotocol Encapsulation over ATM Adaptation Layer (AAL)5 and classical IP over ATM

Allows flexibility to choose the protocol that best suits customers' needs

2048 virtual circuits per port

Offers high scalability to meet the needs of service providers

Product Specifications

Line Card

• Full-duplex ATM interface

• Unspecified bit rate (UBR) and non-real-time variable bit rate (VBR-nrt) service classes


• 16 virtual channel identifier (VCI)/8 virtual path identifier (VPI) bits

• Support for 16- and 32-bit cyclic redundancy checks (CRCs)

• Synchronous Payload Envelope (SPE) scrambling

• 2048 active connections per port, 4096 active virtual circuits per board

• Per-virtual circuit and per-virtual path traffic shaping

• Classical IP and Address Resolution Protocol (ARP) over ATM (RFC 1577)

• Multiprotocol Encapsulation over AAL5 (RFC 1483)

• AAL5, F4/F5 operations, administration, and maintenance (OAM) cells

• User-Network Interface (UNI) 3.0, 3.1, and 4.0, Integrated Local Management Interface (ILMI) 3.0

Table 2 lists the optical specifications for the Cisco 7304 2-Port OC-3 ATM Line Card.

Table 2. Optical Specifications

Fiber Interface

Transmit Power


Input Power

Input Sensitivity

Loss Budgets

Nominal Distance

Multimode (MM)

-20 dBm

-14 dBm

1280 nm

1335 nm

-8 dBm

-23 dBm

0 to 7 dB

1.2 mi

(2 km)

Single mode-intermediate reach (SM-IR)

-15 dBm

-8 dBm

1280 nm

1335 nm

-8 dBm

-28 dBm

0 to 12 dB

9 mi

(15 km)

Tables 3-5 list the environmental specifications, physical specifications, and line card indicators for the Cisco 7304 2-Port OC-3 ATM Line Card.

Table 3. Environmental Conditions

Cisco 7304 2-Port OC-3/STM-1 ATM Line Card


Operating temperature

32° to 104°F (0° to 40°C)

Storage temperature

-4° to 149°F (-20° to 65°C)

Operating humidity

5 to 90% (noncondensing)


-500 to 6500 ft


• Two ports of OC-3 ATM at 155.52-Mbps full duplex


• See Cisco NSE-100 data sheet for more MIB support

Table 4. Physical Specifications

Cisco 7304 2-Port OC-3/STM-1 ATM Line Card



1.92 in. (4.87 cm)


8.44 in. (21.43 cm)


12.94 in. (32.87 cm)


3.0 lb (1.36 kg)

Mean time between failure (MTBF)

5.5 year for system configuration

Table 5. Line Card Indicators

LED Label







Indicates line card is online


Indicates line card bootstrapping is in progress


Indicates line card is offline and deactivated




Indicates line card is ready to be removed in command-line interface (CLI)-controlled OIR


Indicates line card is online




Indicates that a valid SONET1 signal has been detected with no alarm conditions


Indicates that an alarm condition is present


Indicates that no valid SONET signal has been detected




Indicates that the port has been configured and is enabled


Indicates that the port is in diagnostic loopback mode


Indicates that the port has not been configured

1. Synchronous

Product Regulatory Compliance

Products bear CE marking, indicating compliance with the 89/366/EEC and 73/23/ECC directives, which include the following safety and EMC standards:


• UL 60950

• CSA C22.2

• EN60950

• IEC 60950

• TS 001

• AS/NZS 3260


• FCC Part 15 (CFR 47) Class A

• ICES-003 Class A

• EN55022 Class A

• CISPR 22 Class A

• AS/NZS 3548 Class A

• VCCI Class A

• EN55024

• EN50082-1

• ETS300386

Industry EMC, Safety, and Environmental Standards

• GR-63-Core NEBS Level 3 Requirement

• GR-1089-Core NEBS Level 3 Requirement

• ETS 300-019 Storage Class 1.1

• ETS 300-019 Transportation Class 2.3

• ETS 300-019 Stationary Use Class 3.1

Ordering Information

Table 6 provides ordering information for the Cisco 7304 2-Port OC-3 ATM Line Card.

Table 6. Ordering Information

Product Number

Product Description


2-port OC-3 ATM line card for Cisco 7304 Router, MM


2-port OC-3 ATM line card for Cisco 7304 Router, MM, spare


2-port OC-3 ATM line card for Cisco 7304 Router, SM-IR


2-port OC-3 ATM line card for Cisco 7304 Router, SM-IR, spare

Service and Support

Cisco offers a wide range of services programs to accelerate customer success. These innovative services programs are delivered through a unique combination of people, processes, tools, and partners, resulting in high levels of customer satisfaction. Cisco services help you to protect your network investment, optimize network operations, and prepare the network for new applications to extend network intelligence and the power of your business. For more information about Cisco Services, see Cisco Technical Support Services or Cisco Advanced Services.

For More Information

For more information about the Cisco 7304 routers, visit or contact your local Cisco account representative.