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Empowering Intelligent Optical Networks

Product Brief

RUBICON-48

OC-48/12/3 DW/FEC/PM and ASYNC Mapper Device with Strong FEC

Part Number S4815PBI, Revision 2.2, May 2006

Additional Protocol Support

• FEC Frame Synchronous scrambling.

• Programmable sequence detection.

Pin Compatibility to Niagara device

Low Power.13 u CMOS Technology

• 1.2 Volt core operation.

• 2.5 Volt I/O.

APPLICATIONS

• SONET/SDH OC-48/STM-16 DWDM transport systems and

DWDM metro networks.

• Transparent Add-Drop Multiplexing Transponder applications.

• Protocol Transparent Transport.

• IaDI to IrDI FEC transponder chip (6.2 dB gain network to > 8.6 dB

gain network).

GENERAL DESCRIPTION

The AMCC Rubicon-48 device is a wide-area and metropolitan

transport device aimed at next generation applications, required

transparent mapping, and enhanced error correction capability.

The device utilizes the ITU G.709 frame and overhead structures

to enable deployment of full OTN compliant network elements.

Rubicon-48 will support two gain rates, the standard G.975 based

rate of 6.2 dB (raw optical coding gain), and AMCC’s proprietary

EFEC code, rated at greater than 8.6 dB (raw optical coding gain).

The Rubicon-48 device is capable of running both these gains

simultaneously, providing a superb single chip transponder solu-

tion for standard gain to enhanced gain networks. Note that the

Rubicon-48 will employ the same industry leading EFEC code that

was used in the AMCC Niagara device, making these devices

totally compatible. The Rubicon-48 is targeted at 2.5G transport

and will also support the framing and FEC code previously

deployed in AMCC’s industry leading S3062 FEC device, allowing

for in-circuit upgrades of older systems.

DATA INTERFACES

Both the client and network interfaces support two interface

modes, a 16-bit LVDS interface and a 4-bit LVDS interface. Data is

transferred as either 16-bit LVDS parallel data or 4-bit LVDS paral-

lel data with a synchronous clock. The defined low end of the par-

allel client/network interface is 31.25 Mbps (across 4 bits of the

interface) for an aggregate bandwidth of 125 Mbps.

CLIENT PERFORMANCE MONITORING

A SONET/SDH performance monitor supporting OC-48/12/3 and

SDH-16/4/1 rates is provided to perform optional-section and lim-

ited-line termination functions. TOH for the SONET signal is

dropped and added. On chip processing of the critical TOH func-

tions, such as B1, B2, J0, is provided to enable functioning as a

SONET/SDH network element. The performance monitor may

also be configured to provide non-intrusive monitoring while trans-

parently passing through the received signal with no overwrite.

The 2.5 Gbps client signal may be synchronously or asynchro-

nously mapped into the ODU-1 payload. FEC parity check bytes

are then optionally added to form the OTU-1. The device can also

output the ODU-1 with no parity check bytes. In the receive direc-

tion, data is de-mapped from the OTU-1 and control signals are

provided to enable timing regeneration of the client 2.5 Gbps sig-

nal.

When operating in the ITU G.709 OTU-1 or ODU-1 mode, the

SONET monitors are bypassed. On-chip processing of the G.709

overhead is provided to enable single chip G.709 section termina-

tion. G.709 Overhead can be added or dropped as required. Re-

mapping required for synchronization of asynchronous ODU-1 sig-

nals is not supported.

Client-signal monitoring for 8B/10B encoded data is also provided.

AIS SUPPORT

For applications in which the client signal is SONET or SDH, the

Rubicon-48 can generate a SONET/SDH AIS on both the client

ingress and the egress.

For applications in which the client signal is G.709 compliant or for

OTN regenerator applications, Line Fail and un-equipped OTN

AIS is supported. For OTN edge applications, the device can be

provisioned to provide either a SONET/SDH AIS or a OTN

Generic AIS to the client. This facilitates convergence of the

SONET/SDH and OTN functions into a single network element.

ODU MAPPING

ITU compliant client mapping of SONET OC-48 or SDH STM-16

into the ODU-1 signal is supported whereby a G.709 overhead

byte is added to every G.709 sub-frame resulting in an ODU rate

expansion of (239/238). The chip can be configured to insert the

G.709 compliant overhead byte value or to insert user data into

this location. The values assigned to the stuff bytes can be defined

either from a register set on chip or from an external add-drop port.

Start-of-frame signals are provided at the input and output ports to

enable synchronization to the ODU.

LOOPBACK FUNCTIONS

Near-end and far-end loopback is supported for each of the client

interfaces and for the line interface. This enables line and device

testing and fault isolation. Each functional block may be bypassed

as required to support the application. When all blocks are

bypassed, the device allows transparent pass-through of client

data (assuming synchronous inputs).

Key status and alarm signals are provided to outside pins to

enable rapid response to failure conditions. These include but are

not limited to: LOS, OOF, LOF, B1 Errors, and FEC errors. Three

interrupt pins, each with a mask register are provided to enable

prioritization of interrupts and timely interaction with firmware.

In addition to the loopback capabilities of the device, the Rubicon-

48 also employs a unique port swapping capability allowing the

physical ports on the device to be interfaced to either side of the

FEC encoders. This capability increases the flexibility of a single

board design used in a variety of modes.