Cisco Interface Processors

Packet OC-3 Interface Processor


Data Sheet

Packet OC-3 Interface Processor

With the new Packet OC-3 Interface Processor for Cisco 7500 and 7000/RSP series routers, Cisco offers industry-leading broadband data interface bandwidth to support the most demanding applications across both local-area and wide-area networking environments. -Operating at 155 Mbps, the Packet OC-3 interface provides the highest available interface bandwidth for packet-based traffic and is completely compatible with SONET and Synchronous -Digital -Hierarchy (SDH) -network facilities. By using standard packet -protocols with -efficient overhead structures, the Packet OC-3 Interface Processor -maximizes data throughput and line utilization for ex-pensive, high-bandwidth facilities.

Figure 1.: Highest Available Interface Bandwidth for Packet-Based Traffic

In 1991, Cisco pioneered the packet-based High-Speed Serial Interface (HSSI®) to meet the need for high-speed data transport over 45-Mbps DS-3 facilities. Over the last five years, carriers worldwide have invested heavily in SONET/SDH equipment, making SONET/SDH the most widely deployed broadband networking technology. And over the same period the bandwidth requirements of data applications have grown dramatically. The new Packet OC-3 interface now enables these broadband data applications to efficiently access this extensive -broadband transport infrastructure. Equipped with OC-3 interfaces, packet-based networking equipment can match the interface bandwidths -supported by Asynchronous Transfer Mode (ATM) while providing much higher bandwidth efficiencies.

In wide-area networking applications, the Packet OC-3 interface can directly connect to both carrier and private SONET and SDH facilities. SONET/SDH facilities often provide the most reliable transport, because they can be configured based on dual counter-rotating ring topologies. In local-area networking, Packet OC-3 interfaces can be used to provide direct broadband links between routers in a campus or building without the need for an intermediate switch.

Cisco's Packet OC-3 Interface Processor provides a single OC-3 155-Mbps port and is available with either single-mode or multimode interfaces. Packet data is transported using Point-to-Point Protocol (PPP) and is mapped into the STS-3c/STM-1 frame. The Packet OC-3 interface is compliant with RFC 1619, "PPP over SONET/SDH," and RFC 1662, "PPP in HDLC-like Framing." The encapsulations used apply only seven bytes of transport overhead per frame, which is less than half of that involved with ATM using ATM adaptation layer 5 (AAL5) and line card control (LCC) Subnetwork Access Protocol (SNAP) encapsulations. The Packet OC-3 Interface Processor can operate in any Cisco 7500 series or Cisco 7000 series system equipped with a Route Switch -Processor (RSP). In Cisco 7000 series routers, the Packet OC-3 interface processor can access the -system's CxBus; in Cisco 7500 series systems it can utilize the full -gigabit-per-second bandwidth provided by the Cisco 7500 CyBus.

The Packet OC-3 Interface Processor operates on a version of the Cisco Internetwork Operating System (Cisco IOS) software that will support distributed switching and distributed services capabilities.


  • Standards-compliant SONET/SDH interface

  • Supports full-duplex operation at 155 Mbps

  • Intermediate reach optical interface with single-mode fiber

  • Optical interface with multimode fiber

  • Supports SONET/STS-3c and SDH/STM-1 framing and signaling overhead

  • Online insertion and removal (OIR), enabling users to remove, add, or replace interface processors on line

  • 16 to 64 Mbytes of onboard packet and program memory to support transmit and receive buffering

  • Software download capability optimizes operation across long -distance links and reduces management costs by enabling remote administration


Physical Specifications

  • Occupies one slot in any Cisco 7500 series or Cisco 7000 series with RSP

  • Weight: 5 lbs (2.25 kg)

Environmental Specifications

  • Operating Temperature: 32 to 104° F (0 to 40° C)

  • Storage Temperature: -4 to 149° F (-20 to 65° C)

  • Relative Humidity: 10 to 90%, noncondensing

Memory Options

  • 16 MB (default) LAN and metropolitan area applications

  • 32 MB Service provider/national backbone

  • 64 MB International ISP applications

Safety Certifications

  • UL 1950

  • CSA C22.2 No. 950-M29

  • IEC 950

  • EN60950

Electromagnetic Emissions Certifications

  • FCC Class A

  • EN55022A Class B

  • CISPR-22 Class B

  • VCCI Class 2

CE Mark

  • IEC 801-2, 3, 4, 5, 6, 11

Optical Power Budget---Single-Mode

  • 16 dB---approximately 9 miles (15 km)

  • Transmit power (at wavelength 1260-1360 nm): -15 to -8 dBm

  • Receive power: -31 to -8 dBm

  • Complies with Bellcore GR-253 Intermediate Reach Specification

Optical Power Budget---Multimode

  • 11.5 dB---approximately 1.5 miles (3 km)

  • Transmit power (at wavelength 1270-1380nm): -18.5 to -14 dBm

  • Receive power: -30 to -14 dBm


  • SC-duplex connector for network interface


  • Enabled LED---Packet OC-3 is powered and active

  • Rx Carrier LED---Indicates there is light detected on the Rx fiber

  • Rx Packet LED---Indicates a packet was received on the interface


  • RFC 1619 Point-to-Point Protocol over SONET/SDH

  • RFC 1662 Point-to-Point Protocol in HDLC-like Framing

Network Management

  • SNMP agent v1 (RFC 1155-1157)

  • MIB II (RFC 1213)