Cisco Carrier Routing System

Cisco CRS Series 20 port Gigabit Ethernet Flexible Interface Module

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The Cisco ® CRS-1 Carrier Routing System is the industry's first carrier router offering continuous system operation, unprecedented service flexibility, and system longevity. The Cisco CRS-1 is powered by Cisco IOS ® XR Software - a unique self-healing, distributed operating system. As part of a video-enabled IP Next-Generation Network (NGN), the Cisco CRS-1 Series delivers continuous, always-on operation that easily scales to support the massive bandwidth requirements of visual networking experiences such as high-definition IPTV and Cisco TelePresence. These services demand a platform that delivers predictable forwarding performance and efficient, intelligent fabric-based multicast replication. The Cisco CRS-1 Series enables the Internet and NGNs to handle the approaching zettabyte era of carrier IP communications while protecting network investments for decades to come.

Product Overview

The Cisco CRS-1 Series 20-Port Gigabit Ethernet Flexible Interface Module (Figure 1) provides 20 ports of IEEE 802.3-compliant Gigabit Ethernet interfaces and two available Cisco I-Flex shared port adapter (SPA) slots. By providing service intelligence, modularity, and configuration flexibility with fully compatible SPAs, the Cisco I-Flex design offers carriers long-term savings and the ability to handle evolving service delivery requirements, such as SONET-to-Ethernet.
The SPAs can be a mix of Ethernet or Packet over SONET/SDH (POS), and are identical to the SPAs used in other Cisco platforms such as the Cisco XR 12000 Series and the Cisco CRS Carrier Routing System. Gigabit Ethernet physical interface characteristics can be selected using different modular Small Form-Factor Pluggable (SFP) optics - short, long, extra long, and copper interfaces are supported. Extensive per-port and per-VLAN counters simplify network performance monitoring and troubleshooting.

Figure 1. Cisco CRS-1 Series 20-Port Gigabit Ethernet Flexible Interface Module

Features and Benefits

• 20 line-rate Gigabit Ethernet full duplex interfaces

• Two half-height SPA bays

• Per-port flexibility for distance - selected using the appropriate SFP optical or copper modules

• Compatible with all Cisco CRS Series chassis

• Supports in-use insertion and removal without the need to power down the chassis

• Simple configuration, monitoring, and maintenance

Product Specifications

Table 1. Product Specifications



System Compatibility

Compatible with all Cisco CRS-1 and CRS-3 systems

Requires one of the following forwarding engines: CRS-FP40 (on CRS-4/S and CRS-8/S only) or CRS-MSC-40G-B (on CRS-4/S, CRS-8/S, CRS-16/S, and CRS Multi-chassis)

Software Compatibility

Cisco IOS XR Software Release 3.8.1 or later for CRS-1

Cisco IOS XR Software Release 4.0.0 or later for CRS-3

Interface Types

Integrated Gigabit Ethernet using SFPs for physical interfaces

SFPs supported:

• Short wavelength (SX)
• Long reach/long haul (LX/LH)
• Extended distance (ZX)
• Copper (RJ-45) SFP-GE-T

SPAs can be Packet over SONET/SDH (POS) or Ethernet. The following SPAs are supported:

• SPA-5X1GE-V2
• SPA-8X1GE-V2
• SPA-10X1GE-V2
• SPA-1X10GE-L-V2
• SPA-1X10GE-WL-V2
• SPA-8XOC12-POS   

Port Density

20 ports of integrated Gigabit Ethernet per card, each using SFP physical interfaces

Two normal-height SPAs or one double-height SPA


Encapsulations: ARPA, IEEE 802.2/SAP, IEEE 802.3/SNAP

IEEE 802.3x flow control

Jumbo frames (9188 bytes)

IEEE 802.1p tagging

Source/destination MAC accounting and VLAN accounting

• Autonegotiation
• Full-duplex operation
• 802.1Q VLAN termination
• Per-port byte and packet counters for policy drops; oversubscription drops; cyclic redundancy check (CRC) error drops; packet sizes; and unicast, multicast, and broadcast packets
• Per-VLAN byte and packet counters for policy drops; oversubscription drops; and unicast, multicast, and broadcast packets
• Per-port byte counters for good bytes and dropped bytes

Ethernet LED Indicators

LED off: Port is not enabled by software

LED: Port is enabled by software, but there is a problem with the Ethernet link

LED green: Port is enabled by software, and there is a valid Ethernet link

Reliability and Availability

Online insertion and removal (OIR) without affecting system traffic

Field-replaceable SFP optical modules

Network Management

Cisco IOS XR Software command-line interface (CLI)

Simple Network Management Protocol (SNMP)

Extensible Markup Language (XML) interface

Physical Dimensions

Occupies one PLIM slot

Weight: 8.4 lb (3.8 kg)

Height: 20.6 in. (52.2 cm)

Depth: 11.2 in. (28.4 cm)

Width: 1.8 in. (4.49 cm)



Environmental Conditions

Storage Temperature: -40 to 70°C (-40 to 158°F)

Operating Temperature:

Normal: 5 to 40°C (41 to 104°F)

Short-term: -5 to 50°C (23 to 122°F) short-term

Relative Humidity:

Normal: 5% to 85%

Short-term: 5% to 90% but not to exceed 0.024 kg water/kg of dry air

Short-term refers to a period of not more than 96 consecutive hours and a total of not more than 15 days in 1 year. (This refers to a total of 360 hours in any given year, but no more than 15 occurrences during that 1-year period.)

Approvals and Compliance

Table 2. Compliance and Agency Approvals



Safety Standards

UL/CSA/IEC/EN 60950-1

IEC/EN 60825 Laser Safety


AS/NZS 60950

FDA - Code of Federal Regulations Laser Safety


FCC Class A

ICES 003 Class A

AS/NZS 3548 Class A

CISPR 22 (EN55022) Class A

VCCI Class A

BSMI Class A

IEC/EN 61000-3-2: Power Line Harmonics

IEC/EN 61000-3-3: Voltage Fluctuations and Flicker

Immunity (Basic Standards)

IEC/EN-61000-4-2: Electrostatic Discharge Immunity (8 kV Contact, 15 kV Air)

IEC/EN-61000-4-3: Radiated Immunity (10 V/m)

IEC/EN-61000-4-4: Electrical Fast Transient Immunity (2 kV Power, 1 kV Signal)

IEC/EN-61000-4-5: Surge AC Port (4 kV CM, 2 kV DM)

IEC/EN-61000-4-5: Signal Ports (1 kV)

IEC/EN-61000-4-5: Surge DC Port (1 kV)

IEC/EN-61000-4-6: Immunity to Conducted Disturbances (10 Vrms)

IEC/EN-61000-4-8: Power Frequency Magnetic Field Immunity (30 A/m)

IEC/EN-61000-4-11: Voltage DIPS, Short Interruptions, and Voltage Variations


EN300 386: Telecommunications Network Equipment (EMC)

EN55022: Information Technology Equipment (Emissions)

EN55024: Information Technology Equipment (Immunity)

EN50082-1/EN-61000-6-1: Generic Immunity Standard

Network Equipment Building Systems (NEBS)

This product is designed to meet the following requirements (qualification in progress):

SR-3580: NEBS Criteria Levels (Level 3)

GR-1089-CORE: NEBS EMC and Safety

GR-63-CORE: NEBS Physical Protection

Additional Specifications

Table 3. Optical Specifications: Modular SFP Optics

Gigabit Ethernet SFP Optics

Maximum Distance

SX SFP optics

1804 ft (550m)

LX/LH SFP optics

6.2 mi (10 km)

ZX SFP optics

43.5 mi (70 km)

Copper (RJ-45) SFP optics

328 ft (100 m)

Ordering Information

To place an order, visit the Cisco Ordering Home Page.

Table 4. Ordering Information

Product Part Number

Product Name


Cisco CRS-1 Series 20x1GE Flexible Interface Module


Cisco Extended Temperature 1000BASE-SX short wavelength; with DOM


Cisco Extended Temperature 1000BASE-LX/LH long-wavelength; with DOM


Cisco Extended Temperature 1000BASE-ZX extended distance; with DOM


Cisco extended temperature 1000BASE-T NEBS 3 ESD


Cisco Extended Temperature 1000BASE-SX short wavelength; with DOM


Cisco Extended Temperature 1000BASE-LX/LH long-wavelength; with DOM


Cisco Extended Temperature 1000BASE-ZX extended distance; with DOM

End-of-Sale and End-of-Life Announcement for the Select Cisco Gigabit Ethernet SFP Modules

Service and Support

Cisco offers numerous innovative services programs to accelerate customer success. These 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 CRS-1 Series 20-Port Gigabit Ethernet Flexible Interface Module, contact your local account representative or visit: