VSC7166 datasheet(2/2 Pages) VITESSE

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VSC7166

OC-192 Very Short Reach (VSR) Converter IC

SPECIFICA TIONS:

Ten 1.244Gb/s Data Channels

Aggregate 10Gb/s Data Throughput

Clock Frequency Tolerance: +/-200 ppm

1.8V and 2.5V Power Supplies

Up to 80ns Inter-channel Deskewing

2.0W Power Dissipation (Typical)

27mm x 27mm, 256-pin Thermally Enhanced Ball Grid Array (TBGA)

VSC7166 BLOCK DIAGRAM

Expanding use of the Internet has caused very high volumes of

data traffic to become concentrated at places such as central

offices (CO’s), points of presence (POP) and portal sites. At

these sites many pieces of equipment such as high-speed

routers, Dense Wavelength Division Multiplexing (DWDM)

equipment and Add/Drop Multiplexors (ADM) are located in

close proximity (co-located) and must be connected by

extremely high throughput data links. At the core of the network

such high volume data traffic is efficiently handled using

Synchronous Optical Network (SONET) links. To date, these

links have been optimized for long haul transmission where the

high cost of traditional lasers has not been a factor. For short

reach links between co-located equipment it is highly desirable

to use much less expensive arrays of Vertical Cavity Surface

Emitting Lasers (VCSEL’s). An integrated circuit is necessary to

form the interface between the traditional SONET network and

VCSEL based optical modules and the VSC7166 fulfills this role.

GENERAL DESCRIPTIONS

The VSC7166 is used to interface between

OC-192

Framers

and

Parallel

Optical

Modules. In the Serializer, 16-bit OC-192 data

from the Framer is mapped and encoded

onto twelve 1.244 Gb/s, 8b/10b outputs, with 1

of the twelve outputs being used for XOR protection and another

of the twelve for EDC. In the Deserializer, the twelve 1.244 Gb/s

inputs are decoded and remapped to SFI-4 OC-192 data for

the Framer.

The redundant channel permits data to be

reconstructed in the deserializer even if a channel fails. The 16-

bit 622 MHz signals and the 12 1.244 Gb/s interfaces both utilize

LVDS signaling. These devices are intended for high-speed

Router-to-Router and DWDM/Sonet Terminal-to-Router

connections.

The VSC7166 is designed to conform to the Optical Inter-

networking Forum’s (OIF) OIF-VSR4-01.0 Implementation

Agreement.

Transmitter

Receiver

DIP/N(15:0)

Framer and

Byte Clock

8B/10B

Enclode

1.24Gb/s

Tranceivers Tx

XOR

EDC

120

ON/P(11:0)

To Transit

Optics

Byte Mux

CRC Check

Protection

Switching

PRBS Check

Alignment

Buffer

8B/10B

Decode &

LOSyn

1.24Gb/s

Tranceivers Rx

JTAG

Boundary Scan

Processor

Interface Block

120

OP/N(15:0)

IN/P(11:0)

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