belden - ok - bicsi · pdf filerajesh shenoy business director – enterprise &...
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Rajesh ShenoyBusiness Director – Enterprise & Broadcast Solutions, APacBelden Inc.12, September 2014
Hyper Data CentresConcepts and Challenges in Ultra Low Loss Fiber Channels
1. Fiber Data Center Architectures & Trunking2. Polarity & Gender
• Components• 4 Simple Rules – Channel Polarity
Overview
Topology: Options for Different Needs
ActiveEquipment
ActiveEquipment
Connector ConnectorConnector ConnectorConnector Connector
ActiveEquipment
ActiveEquipment
Connector ConnectorConnector ConnectorConnector ConnectorConnector Connector
2-Point “Simple Channel”
3-Point “ZDA Channel”
ActiveEquipment
ActiveEquipment
Connector ConnectorConnector ConnectorConnector ConnectorConnector Connector
4-Point “Main Cross Connect”
Connector Connector
ActiveEquipment
ActiveEquipment
Connector ConnectorConnector ConnectorConnector ConnectorConnector Connector
5-Point “Main Cross Connect w/ZDA”
Connector ConnectorConnector Connector
Topology: Options for Different Needs (cont.)• Low IL
− Few connections • Low Latency
− Works well for ToR “Leaf & Spine” • Easy MAC
− No MACs in high-density areas (static)
• Fast Install− Few large trunks vs many small trunks
• Fast Upgrade − Across a row vs. the whole DC
• Secure Switch − No access to SW cabinet for MAC/expansion
• Secure MDA− No access to MDA for MAC/expansion
• Single Pathway/Circuit per Cable• One Instance of a Protocol
Fiber Topology Concepts: Channel
10G Ethernet Channel16G Fibre Channel
40G BiDi“DX” Duplex Channel
PULL
1
PULL
1
40G Ethernet Channel100G Ethernet Channel
“SR4” Bi-Directional Channel
Simple Channel Examples (cont.)Duplex Channel
SR-4 Channel
• Multiple Pathways/Circuits per Cable• Multiple Instances of a Protocol(s)
Fiber Topology Concepts: Trunking
Duplex ChannelTrunking
SR4 Bi-Directional Channel Trunking
PULL
1 PULL
1
PULL
1
PULL
1
Faster to Install Less Cable ClutterUpgradability
Trunking Examples
MPO-12 Trunk
ActiveEquipment
Connector Connector
Patch Cords
Permanent Link
ActiveEquipment
Connector Connector
ActiveEquipment
Connector Connector
ActiveEquipment
Connector Connector
ActiveEquipment
Connector Connector
ActiveEquipment
Connector Connector
Connector
Connector
Connector
Connector
Connector
Connector
Cassette
ActiveEquipment
ConnectorConnector
ActiveEquipment
ConnectorConnector
ActiveEquipment
ConnectorConnector
ActiveEquipment
ConnectorConnector
ActiveEquipment
ConnectorConnector
ActiveEquipment
ConnectorConnector
Connector
Connector
Connector
Connector
Connector
Connector
Patch Cords
ConnectorConnector
Cassette
Connector Connector
MC (Main Cross-Connect in the MDA)
HDA (Horizontal
Distribution Area)
MDA (Main Distribution Area)
EDA (Equipment Distribution Area)
Trunking Examples (cont.)Duplex Channel
SR-4 Channel
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1
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1
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1
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1
PULL
1
PULL
1
PULL
1
PULL
1
PULL
1
PULL
1
PULL
1
PULL
1
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1
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1
PULL
1
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1
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Connectivity at the Active Equipment: ENet(Multimode)
Ethernet Protocol Connector Type
10GBase-SR
40G BiDi
40GBase-SR4
100GBase-SR4 (Future)
100GBase-SR10 (Legacy)
MPO-12Female
LCDuplex
MPO-24
Connectivity at the Active Equipment: ENet(Singlemode)
Ethernet Protocol Connector Type
10GBase-L/LX4/ER
40GBase-LR4
100GBase-LR4/ER4
LCDuplex
LC Duplex Polarity
“CROSSOVER” = TX-RX Flip
“STRAIGHT” = No TX-RX Flip
Odd Number of Segments = GOOD
Duplex Channels – A/B Polarity Scheme
Even Number of Segments = GOOD
TX/RX Flip is always maintained due to always having an odd number of elements that reverse the polarity (i.e. cable segments and couplers/adapters)
Odd Number of Segments = BAD
Duplex Channels – A/A Polarity Scheme
Even Number of Segments = GOOD
TX/RX flip does not happen in cable segments, only in couplers/adapters.
Even numbers of adapters cancel out eliminating the TX/RX flip.
MPO Gender
Actives are MALE− Use MPO FEMALE patch cords
Prevent damage to Actives − FEMALE to FEMALE patch cords
Result: − Use MALE to MALE Trunksⱡ
ⱡ For ZDA configurations Male to Female will be required on one segment
MPO Gender
MPO-Female to MPO-Female = BAD (unstable IL)MPO-Male to MPO-Male = BAD (no mate / damage)
MPO-Male to MPO-Female = GOOD
MPO Polarity
TYPE
A
TYPE
B
TYPE
C
MPO to LC: Hydra Assemblies & Cassettes
FX Ultra Cassette Hydra Assembly
Cassette Type-A(Standard)
Cassette Type-A ALT(Standard)
Cassettes
LC Fanout or Traditional Hydra Assembly – Type A (Standard)
40G(SR4) Hydra Assembly – Type A (Standard)
• LC Duplex – Type A/B
• MPO-12– Female to Female– Type B
1. Use only ONE type of Patch Cord per facility
RULE
#1
Simplify for the IT staff
2. Use FEMALE cassettes
RULE
#2
Ensures Rule 1 compliance when upgrading
PULL
1
PULL
1
PULL
1 PULL
1
MALE FEMALE
MALE FEMALE
3. Use MALE to MALE, Type-B MPO Trunks RULE
#3
Type C: Mis-matched MPO-12 Patch Cords
Type A: Mis-matched DX Patch Cords
PULL
1
PULL
1
PULL
1 PULL
1
PULL
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1
3. Use MALE to MALE, Type-B MPO Trunks (cont.)RULE
#3Type B: Common DX Patch Cords
PULL
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PULL
1 PULL
1
PULL
1 PULL
1
Type B: Common MPO-12 Patch CordsTIP: Mix A and A-ALT Cassettes
4. Exception: Male to Female, Type-A MPO Trunks
RULE
#4ZDA Configurations: 3-Point and 5-Point Architectures
EXTENSIONTRUNK (M-F)
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1 PULL
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