Cisco Optical Services Modules

Cisco 7600 Series 1-Port OC-48c/STM-16 POS/SDH OSM

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High-Density OC-48c/STM-16 Connectivity for Consolidated Service Provider POPs with Service Delivery over IP or MPLS Core Networks

The rapid growth of Internet-enabled user applications has led to an increase in the bandwidth provisioned through service provider networks. To accommodate this growth, service providers are consolidating existing network architectures that deliver traditional Layer 2 WAN services, such as Frame Relay and ATM, with architectures that deliver Layer 3 WAN services, such as high-speed Internet access and Layer 3 VPNs. This network consolidation enables service providers to optimize their capital investments so that all such expenditures simultaneously benefit all network services.

Figure 1

1-Port OC-48c/STM-16 POS Enhanced OSM for Cisco 7600 Series Router



Achieving network consolidation is particularly challenging at network aggregation points. The devices at these points must be able to deliver multiple Layer 2 and Layer 3 services, while providing efficient transfer of network traffic from customer access nodes to the core network and back. These aggregation devices must simultaneously provide scalable bandwidth and interface density between the access and core networks; support numerous network protocols, as well as quality-of-service (QoS), security, and accounting features; and be compatible with the existing SONET infrastructure.
Cisco ® 7600 Series routers provide the performance, density, and features needed for network aggregation devices in consolidated network architectures. To provide aggregation services over an existing SONET infrastructure, Cisco Series routers can be configured to support various SONET interface cards, such as the Cisco 1-port OC-48c/STM-16 Packet over SONET (POS) enhanced optical services modules (OSMs). These enhanced OSMs deliver advanced IP and Multiprotocol Label Switching (MPLS) services based on the Cisco Parallel Express Forwarding (PXF) network processor. The 1-port OC-48c POS includes two PXF processors-one for transmit processes and the other for receive processes.


The Cisco 1-port OC-48c/STM-16 POS enhanced OSM provides the benefits listed in Table 1.

Table 1. Features and Benefits of the OC-48c/STM-16 POS Enhanced OSM.



Software-upgradable feature sets using the Cisco PXF network processor

Greater flexibility to support new features through software upgrades, while delivering performance similar to application-specific integrated circuit (ASIC)-based designs

Throughput of up to 5.5 Mpps per PXF IP services processor

High performance to support line-rate OC-48/STM-16 bandwidth

Four ports of Gigabit Ethernet, in addition to the OC-48 SONET ports

Simultaneous WAN and LAN access to meet diverse applications

Direct memory access (DMA) memory of 256 MB per PXF network processor

Supports a minimum of 8000 QoS queues per PXF network processor

Support for a minimum of 511 and a maximum of 1023 virtual routing and forwarding (VRF) instances per chassis for MPLS Layer 3

Outstanding service density per chassis for support of MPLS VPN services for end customers

Support for enhanced QoS features, including Class-Based Weighted Fair Queuing (CBWFQ), Low-Latency Queuing (LLQ), and Weighted Random Early Detection (WRED)

Improved delivery of service-level agreements (SLAs) to end customers

Support for Layer 2 network services, including Frame Relay and ATM, transported over MPLS network architectures

Ability to deliver both Layer 2 services, such as Frame Relay, Ethernet, and ATM, and Layer 3 services, such as Internet access and 2547 VPNs, in a consolidated network architecture



The Cisco 7600 Series enables Cisco customers to take advantage of their existing investments in Cisco equipment. In addition to the enhanced OSMs, the Cisco 7600 Series can be configured with any combination of traditional Cisco Catalyst ® 6000 Series LAN interfaces, and can also be configured with Cisco 7500 and 7200 series WAN port adapters. As a result, the Cisco 7600 Series offers outstanding scalability, with WAN interfaces from DS-0 through OC-48/STM-16 and LAN interfaces from 10/100-Mbps Ethernet to Gigabit Ethernet and 10 Gigabit Ethernet.


The Cisco 7600 Series is specifically designed to meet the high-availability requirements for service provider networks. Each Cisco 7600 Series router provides a Network Equipment Building Standards 3 (NEBS-3)-compliant chassis. Furthermore, the Cisco 7600 Series supports fully redundant route processing and forwarding configurations, with the ability to route using such core protocols as Border Gateway Protocol Version 4 (BGP4), Intermediate System-to-Intermediate System (IS-IS), and Open Shortest Path First (OSPF), as well as support for QoS and packet filtering. The Cisco 7600 Series supports a 720-Gbps switch fabric, providing high aggregate throughput, as well as high port density, enabling service providers to optimize space utilization in the central office. Table 2 shows the OC-48 port densities that can be supported by the Cisco 7600 Series router with the 1-port OC-48c/STM-16 enhanced OSM.


Table 2. 1-Port OC-48c/STM-16 POS Enhanced OSM Chassis and Rack Density*


Cisco 7609 Chassis Density

Cisco 7609 Rack Density


Seven OC-48 ports and 30 Gigabit Ethernet ports

14 OC-48 ports and 60 Gigabit Ethernet ports

* Based on the following configuration:

• One Supervisor Engine 720 per Cisco 7609 chassis

• Seven 1-port OC-48 POS OSMs per Cisco 7609 chassis

• Two Cisco 7609 chassis per 7-foot rack


Table 3 lists parts and ordering information for the OSMs.


Table 3. Enhanced OSMs for 1-Port OC-48c/STM-16 POS Versions

Model Number



1-port OC-48/STM-16 SONET/SDH enhanced OSM, single-mode, short-reach with 4 Gigabit Ethernet (GE)


1-port OC-48/STM-16 SONET/SDH enhanced OSM, single-mode, short-reach with 4 GE (spare)


1-port OC-48/STM-16 SONET/SDH enhanced OSM, single-mode, intermediate-reach with 4 GE


1-port OC-48/STM-16 SONET/SDH enhanced OSM, single-mode, intermediate-reach with 4 GE, Spare


1-port OC-48/STM-16 SONET/SDH enhanced OSM, single-mode, long-reach with 4 GE


1-port OC-48/STM-16 SONET/SDH enhanced OSM, single-mode, long-reach with 4 GE, Spare


128 MB ECC memory for OSMs


256 MB ECC memory for OSMs


512 MB ECC memory for OSMs



OC-48c/STM-16 POS Specifications

SONET/SDH Compliance:

• Telecordia (Bellcore) GR-253-CORE (as applicable)

• ITU-T G.707, G.957, G.825 (as applicable)

• Support for 1+1 SONET Automatic Protection Switching (APS) as per GR253-CORE-per port, per line card, per chassis (as applicable)

• Support for 1+1 SDH Multiplex Section Protection (MSP) as per G.783 Annex A-per port, per line card, per chassis (as applicable)


• IETF RFC 1661, Point-to-Point Protocol (PPP)

• IETF RFC 1973, PPP in Frame Relay

• IETF RFC 1662, PPP in High-Level Data Link Control (HDLC)-like framing

• IETF RFC 2615, PPP over SONET/SDH with 1+x43 Self-Synchronous Payload Scrambling

SONET/SDH Errors, Alarms, and Performance Monitoring:

• Signal Failure Bit Error Rate (SF-ber)

• Signal Degrade Bit Error Rate (SD-ber)

• Signal Label Payload Construction (C2)

• Path Trace Byte (J1)

• Section:

– Loss of Signal (LOS)

– Loss of Frame (LOF)

– Error Counts for B1

– Threshold Crossing Alarms (TCA) for B1

• Line:

– Line Alarm Indication Signal (LAIS)

– Line Remote Defect Indication (LRDI)

– Line Remote Error Indication (LREI)

– Error Counts for B2

– Threshold Crossing Alarms (TCA) for B2

• Path:

– Path Alarm Indication Signal (PAIS)

– Path Remote Defect Indication (PRDI)

– Path Remote Error Indication (PREI)

– Error Counts for B3

– Threshold Crossing Alarms (TCA) for B3

– Loss of Pointer (LOP)

– New Pointer Events (NEWPTR)

– Positive Stuffing Event (PSE)

– Negative Stuffing Event (NSE)

– Path Unequipped Indication Signal (PUNEQ)

– Path Payload Mismatch (PPLM) Indication Signal

SONET/SDH Synchronization:

• Local (internal) timing (for inter-router connections over dark fiber or WDM equipment)

• Loop (line) timing (for connection to SONET/SDH equipment)

• -20 ppm clock accuracy over full operating temperature

Network Management:

• Local loopback

• Network loopback

• NetFlow data export

• RFC 1595, Performance Statistics for Timed Intervals (current, 15-minute, multiple-15-minute, and 1-day intervals)

• Regenerator section

• Multiplex section

• Path-errored seconds

• Severely errored seconds

• Severely errored framed seconds

• Connector:

– SC connector


Table 4. POS Optical Specifications


Output Power

Input Power

Input Sensitivity


Fiber interface







Single-mode short reach

-10 dBm

-3 dBm

0 dBm

-18 dBm

1266 nm

1360 nm

Single-mode intermediate reach

-5 dBm

0 dBm

0 dBm

-18 dBm

1260 nm

1360 nm

Single-mode long reach

-2 dBm

+3 dBm

-9 dBm

-28 dBm

1500 nm

1580 nm


Gigabit Ethernet Specifications

• IEEE 802.3z-compliant

• GBIC-based Gigabit Ethernet Interfaces with SC connectors:


GBIC Distance

• 1000BASE-LX: 50 µm multimode fiber up to 550 m

• 1000BASE-LX: 9/10 µm single-mode fiber up to 5 km

• 1000BASE-LH: 62.5 µm multimode fiber up to 550 m

• 1000BASE-LH: 50 µm multimode fiber up to 550 m

• 1000BASE-LH: 9/10 µm single-mode fiber up to 10 km

• 1000BASE-ZX: 9/10 µm single-mode fiber up to 70 km

• 1000BASE-ZX: dispersion-shifted fiber up to 100 km

• Support for IEEE 802.1Q VLAN trunking with up to 4000 simultaneous VLANs

• Support for Hot Standby Router Protocol (HSRP)

• IEEE 802.3x support for autonegotiation flow control

• Support for Jumbo frames with a maximum transmission unit (MTU) of 9192 bytes

Cisco 7600 Series System Features

• Hardware-based Cisco Express Forwarding at 30 Mpps

• Access control list (ACL) application at 30 Mpps

• QoS classification at 30 Mpps

• Policy routing at 30 Mpps

• Support for 128,000 traffic accounting entries per system

• Support for online insertion and removal (OIR)

• Support for 200 ms of packet buffering per WAN port

• Support for SNMP versions 1 and 2 and four Remote Monitoring (RMON) groups per port: statistics, history, alarms, and events

Physical Specifications of 1-Port OC-48c/STM-16 POS OSM

• Occupies one slot in any Cisco 7600 Series chassis

• Occupies one slot in any Cisco Catalyst 6500 Series chassis

– WS-C6506-Cisco Catalyst 6506 chassis

– WS-C6509-Cisco Catalyst 6509 chassis

– WS-C6509-NEB-Cisco Catalyst 6509 chassis for NEBS environments

• One OC-48c/STM-16 port supported per OSM

• Four Gigabit Ethernet optical ports per OSM

• Up to seven 1-port OC-48c/STM-16 optical modules supported in a 9-slot chassis

• Required with either Cisco 7600 Series or Cisco Catalyst 6500 Series chassis:

– Supervisor Engine 720: WS-SUP720-3BXL

– Supervisor Engine 2: WS-X6K-S2-MFSC2

• Recommended with either Cisco 7600 Series or Cisco Catalyst 6500 Series chassis:

– Switch fabric module (only needed with Supervisor Engine 2)

– 256 Gbps crossbar fabric: WS-C6500-SFM

• Dimensions (H x W x D): 1.2 x 14.4 x 16 in. (3.0 x 35.6 x 40.6 cm)

• Weight: 11.0 lb (5 kg)

• Power requirement: 201W per module

• Calculated Mean Time Between Failure (MTBF): seven years for system configuration

Indicators and Interfaces

• Status: green (operational)/red (faulty)/orange (module booting or running diagnostics)

• Link good: green (port active)/orange (disabled)/off (not active/connected)/blinking orange (failed diagnostic and disabled)

Processors and Memory

• One 262-MHz R7000 MIPS RISC processor

• Configurable packet/route table memory options:

– 128 MB ECC SDRAM (default)




Cisco PXF IP Services Processor(s):

• Provides up to 5.5 Mpps of distributed IP service application per Cisco PXF IP Services Processor

• Nonconfigurable Cisco PXF memory per line card:

– 256 MB SDRAM of route table memory per Cisco PXF IP Services Processor

– 128 MB SDRAM of packet buffer memory per Cisco PXF IP Services Processor (CRC Checks per Packet)

– 8 MB SSRAM of packet processing memory per Cisco PXF IP Services Processor

MIB Support

• SONET MIB (RFC 1595)

• RFC 1157 SNMP

• RFC 1901 - 1907 SNMP v2c


• IF-MIB (RFC 1573)



• RMON MIB (RFC 1757)



• RFC1213-MIB (MIB-II)


• IP Statistics MIB






Environmental Conditions

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

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

• Relative humidity: 5 to 90 percent, noncondensing

• Operating altitude: -500 to 10,000 ft

Regulatory and Safety Compliance

• UL 1950

• CAN/CSA C22.2 No.950-95

• EN 60825-1 Laser Safety (Class 1)

• 21CFR1040 Laser Safety

• IEC60825-2

• EN60950

• IEC 60950

• TS 001

• AS/NZS 3260

• EMC Compliance

• FCC Part 15 (CFR 47) Class A

• VCCI Class A

• EN55022 Class A

• CISPR 22 Class A

• AS/NZS 3548 Class A

• EN55024

• CE Marking

• NEBS Level 3 Compliance

• The Cisco 7600 Series chassis has been certified as NEBS Level 3 compliant, according to the following specifications:

– GR-63-CORE - NEBS: Physical Protection

– GR-1089-CORE - NEBS: EMC and Safety

• ETSI Compliance

• ETS-300386-2 Switching Equipment

Minimum Software Revision

• Cisco IOS® Software Release 12.1(12)E (when used with Supervisor Engine 2)

• Cisco IOS Software Release 12.2(17a)SXA (when used with Supervisor Engine 720)