Transcript VSR - Optical Internetworking Forum (OIF)

Work at OIF on Interfaces for Optical
Modules including Very Short Reach
(VSR) and Electrical Interfaces
Raj Savara
Network Elements Inc.
Why VSR Interfaces?
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Explosive growth in the demand for bandwidth is
fuelling the development of optical networks
Optical Networking has increased the number of NE in
a carrier’s central office and the related NE –NE
interconnecting Cost
OIF recognized this and started a project on lowering
the cost of these very short reach interfaces (<2Km)
OIF has announced 4 VSR Implementation Agreements
to address Low cost intra office interconnect
applications
Very Short Reach (VSR) interfaces
Standards Interface
Transponders
VSR
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VSR
IP
VSR
VSR
VSR
PXC/EXC
Standard SONET frame format
Promotes multiple vendors
Promotes interoperability
VSR
VSR
ADM
ATM
Vendor Specific
VSR
VSR
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Transponders
Vendor Specific
Reach 2m to 2km
Multiple client signals
Low cost
VSR Reference Application Models
Reference Application 1:
2m to between 50m and 100m direct connection
Reference Application 3:
2m to 600m, with 0-2
patch panels
Reference Application 2:
2m to 300m, with 0-2 patch panels
Reference Application 4:
2m to 600m, one PXC, and 0-4 junction
boxes
Interface Definition for VSR-1 Implementation
Agreement (IA)
OC-192
FRAMER
16:12
SERDES
chip
12:16
SERDES
chip
VCSEL Laser Array
OC-192
FRAMER
PIN PD Array
VSR-1 : 12 Fiber optical Link running at 1.25Gb/s between two Network Elements.
10 fibers carry the data
 1 carries CRC error correction information
 1 fiber carries parity of the 10 data fibers
 This enables hitless correction of errors on any single fiber, including the loss of a fiber.
 Fiber Type : 400KHz, MM Fiber
 Reach: 300m
 Laser: 850nmVCSEL
 Field termination is supported
 link electronics automatically compensate for ribbon orientation.
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VSR-1 Satisfies Reference Application Model 1 and 2
Interface Definition for VSR-2/5 IA
OC-192
FRAMER
16:1
SERDES
chip
FP Laser
1 :16
SERDES
chip
OC-192
FRAMER
PIN
VSR-2/5: 1310 nm serial OC-192 SMF VSR optical link between two network elements.
 1 Single Mode Fiber
 Based on G.693, ITU Specifications
 Fiber Type : G.652, SM Fiber
 Reach: 600m
 Link budget: 6dB VSR-2, 11dB VSR-5
 Laser: un-cooled 1310nm , FP
 Field termination is supported
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VSR-2/5 Satisfies Reference Application Model 1 ,2 and 3
Interface Definition for VSR- 3 IA
OC-192
FRAMER
16:4
SERDES chip
VCSEL Laser Array
4:16
SERDES chip
OC-192
FRAMER
PIN PD array
VSR-3 : 4 Fiber optical Link running at 1.25Gb/s between two Network Elements.
 4 fibers each carry the 2,5Gb/s data
 Fiber Type : 500KHz, MM Fiber
 Reach: 600m
 Laser: 850nmVCSEL
 Field termination is supported
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VSR-3 Satisfies Reference Application Model 1 and 2
Interface Definition for VSR-4 IA
OC-192
FRAMER
16:1
SERDES chip
1 :16
SERDES chip
VCSEL Laser
OC-192
FRAMER
PIN
VSR-4: 850 nm serial SMF VSR optical link (VSR-4) between two network elements.
1 Multi Mode Fiber
Reach: 85m using 500MHz.km 50 mm fiber,
300m using 2000 MHz.km 50 mm fiber
Laser: 850nm VCSEL
Field termination is supported
VSR-4 Satisfies Reference Application Model 1 and 2
Why SFI Interfaces?
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Explosive growth of 10Gb/s systems required a common interface
to connect stream data from Chip to Chip, and Chip to Modules.
SFI-4 SerDes Framer Interface is used for SONET, Forward Error
Correction, and IEEE802.3ae (XSBI).
SFI-4 phase 2 is a 4 lane interface with 64/66 encoding. Each lane
does not require any clock, or alignment to adjacent lanes.
CEI is a 10Gbps serial interface in development at OIF.
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Two speeds 10Gbps and 6Gbps.
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Lower speed for Fibre channel and backplanes.
Higher speeds for XFI interfaces and backplanes.
Two Distances for XFI and backplane applications.
OIF Electrical Interfaces
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This interface is Demonstrated here at the OIF
booth.
FEC chips also use SFI4 phase 1. This would be a
block between the Framer and the 300 pin MSA
module.
Network
Elements
300pin MSA
transponder
Framer or
PHY MAC
SPI-4 Phase 1/2
SFI-4 Phase 1
VSR-2/5
OIF Electrical Interfaces
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SFI4 Phase 1
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16 bit LVDS with
clock bi-directional
Used on all 300 pin
MSA modules
Used on 200 pin MSA
modules
See live demo of
modules with this
interface at SFI4
demo table.
OIF Electrical Interfaces
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SFI4 Phase 2
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4 lane self clocking
with de-skew, 64/66
encoding, and bidirectional.
Used for XenPak, X2,
& XPAK modules with
70 pin connectors.
XENPAK: 6.7 in2 / 4400 mm2
1.4 x 4.8 x 0.7 in
36 x 121 x 17mm
X2: 5.2 in2 / 3400 mm2
1.4 x 3.7 x 0.5 in
36 x 95 x 11mm
XPAK: 4.3 in2 / 2800 mm2
1.4 x 3.1 x 0.4 in
36 x 79 x 10mm
OIF Electrical Interfaces
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CEI 10Gbps serial
interface (In work at OIF)
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Single lane interface for
Framer, backplane
interconnect, self clocking,
and bi-directional.
Used on all XFP modules
with 30 pin connectors.
Capable of 1m and two
connectors over FR4 for
backplane applications.
XFP: 2.1 in2 / 1400 mm2
0.7 x 3.0 x 0.3 in
18 x 78 x 9 mm
NEI Modules using OIF interfaces
MSA300: 6.6 in2 / 4100 mm2
2.2 x 3.0 x 0.5 in
56 x 74 x 14 mm
XENPAK: 6.7 in2 / 4400 mm2
1.4 x 4.8 x 0.7 in
36 x 121 x 17mm
MSA200: 5.1 in2 / 3200 mm2
1.7 x 3.0 x 0.6 in
42 x 75 x 16 mm
XPAK: 4.3 in2 / 2800 mm2
1.4 x 3.1 x 0.4 in
36 x 79 x 10mm
X2: 5.2 in2 / 3400 mm2
1.4 x 3.7 x 0.5 in
36 x 95 x 11mm
XFP: 2.1 in2 / 1400 mm2
0.7 x 3.0 x 0.3 in
18 x 78 x 9 mm
OIF Interfaces for Modules
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OIF creates high speed electrical
interfaces for true interoperability
between component suppliers.
OIF’s Live demonstration proves
Implementation agreements WORK!
OIF is paving the way for next generation
interfaces such as CEI.