CS4815 AMCC [Applied Micro Circuits Corporation], CS4815 Datasheet - Page 2

• Manufacturer Part Number: CS4815
• Description: OC-48/12/3 DW/FEC/PM and ASYNC Mapper Device with Strong FEC
• Manufacturer: AMCC [Applied Micro Circuits Corporation]

Additional Protocol Support
Pin Compatibility to Niagara device
Low Power.13 u CMOS Technology
APPLICATIONS
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
• FEC Frame Synchronous scrambling.
• Programmable sequence detection.
• 1.2 Volt core operation.
• 2.5 Volt I/O.
• SONET/SDH OC-48/STM-16 DWDM transport systems and
• Transparent Add-Drop Multiplexing Transponder applications.
• Protocol Transparent Transport.
• IaDI to IrDI FEC transponder chip (6.2 dB gain network to > 8.6 dB
2
DWDM metro networks.
gain network).
RUBICON-48
OC-48/12/3 DW/FEC/PM and ASYNC Mapper Device with Strong FEC
Empowering Intelligent Optical Networks
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.
Part Number S4815PBI, Revision 2.2, May 2006
Product Brief