1.
Meet stringent latency demands with time-sensitive
networking technology
November 2022
FSP 150-XG418 now features express forwarding for low-latency applications

2.
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Latency-sensitive applications
Video studio
Mobile data processing
(distributed unit, DU)
Enterprise
headquarters
Industrial IoT requires fast,
reliable data delivery with very
low jitter
Video and audio bridging
does not tolerate
latency variations
Mobile fronthaul networks are
sensitive to one-way delays
• High loads create congestion and add latency
• Long frames need to be sent out before other traffic may follow
Challenges

3.
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802.1Qbu/802.3br frame preemption and interspersing express traffic
Express traffic forwarding
Time
Critical traffic
Preemptable traffic
High
Low
Time
High
1 Low 2
In
In
Out
Time
Express traffic
Best-effort traffic
High
Low
Time
High
In
In
Out
No preemption
Low
With preemption
Latency improvement
MAC merge sublayer (IEEE 802.3br) intersperse express traffic with preemptable traffic

4.
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Use case: disaggregated 5G RAN architecture
Evolved packet core
3G/4G RAN
5G RAN
Backhaul
Carrier Ethernet
Midhaul
Ethernet
(F1)
New functional
split
40-200km
20-40km
0-10km
Radio
unit (RU)
Distributed
unit (DU)
Central
unit (CU)
Fronthaul
Radio Baseband unit
Ethernet
(Fx)
5G decomposition into radio unit, distributed unit and central unit

5.
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Latency requirements at Fx interface
CoS Traffic
Max. one-
way frame
delay
Use case
Max. one-
way frame
loss ratio
High25
User plane (fast)
25µs Ultra-low latency
applications
10-7
High100 100µs Full LTE or NR performance
High200
200µs Installations with long fiber
links
High500 500µs Large latency installations
Medium
User plane (slow),
C&M plane (fast)
1ms
All 10-7
Low C&M plane 100ms All 10-6
Source: eCPRI 2.0 specification
• Different service classes with
very demanding latency
requirements for highest grade
• Please note: fiber adds 5µs/km
• Additional timing requirements
for absolute time error at radio
sites as well as alignment error
between neighboring sites
• Transport network needs to be
time-aware, featuring boundary
clock class C capability
Latency and timing
5G decomposition into radio unit, distributed unit and central unit

6.
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One-way delay performance in 5G fronthaul case
25GbE
FSP 150-XG418
Express forwarding meets even the most stringent CoS requirements in 5G fronthaul
Distributed
unit (DU)
Cell sites
hosting radio
unit (RU)
Latency Average Min Max
Express traffic 4,03µs 3,96µs 4,44µs
Preemptable
traffic
10,95µs 10,00µs 12,05µs
Latency Average Min Max
Express traffic 4,04µs 3,96µs 4,43µs
Preemptable
traffic
203,01µs 10,70µs 209,70µs
no impact
✓
No congestion High congestion

7.
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A perfect solution for mobile fronthaul and other demanding applications
FSP 150-XG418 featuring express traffic forwarding
FSP 150-XG418 – 100Gbit/s demarcation
and edge aggregation
100G edge aggregation device for latency-sensitive applications
• Express forwarding of
eCPRI/latency-sensitive
traffic
• Classification of express
traffic based on VLANs
• Preemption of non-express
frames on 10/25G ports
• SyncE and PTP boundary
clock class C

8.
Thank you
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