Nortel 4526FX AL4500B01-E6 Manual Do Utilizador
Códigos do produto
AL4500B01-E6
3
measured the stack performance across
all 160 10/100/1000 Gigabit Ethernet
ports with Ethernet frame sizes of 64,
128, 256, 512, 1,024, 1,280 and 1,518
bytes. Tests verified 100 percent
throughput for all Ethernet frame sizes,
clearly demonstrating the superior
performance of ERS 4500s configured
in an eight-switch stack.
all 160 10/100/1000 Gigabit Ethernet
ports with Ethernet frame sizes of 64,
128, 256, 512, 1,024, 1,280 and 1,518
bytes. Tests verified 100 percent
throughput for all Ethernet frame sizes,
clearly demonstrating the superior
performance of ERS 4500s configured
in an eight-switch stack.
Zero frame loss performance
in an eight-switch stack
configuration
In this test, engineers sent a total of
238 million 64-byte frames per second
from the Spirent test tool across 160
10/100/1000BaseT ports in a port-
pairing test configuration. Engineers
238 million 64-byte frames per second
from the Spirent test tool across 160
10/100/1000BaseT ports in a port-
pairing test configuration. Engineers
verified that the stack consisting of eight
ERS 4500s dropped absolutely no
packets — demonstrating, once again,
the stellar performance of the ERS 4500
Series in this configuration.
ERS 4500s dropped absolutely no
packets — demonstrating, once again,
the stellar performance of the ERS 4500
Series in this configuration.
Low jitter and latency in a
standalone switch configuration
Within the same configuration, engineers
measured the average latency and its
standard deviation — a statistical
method of calculating how much the
latency of a set of received packets varies
from the mean. Engineers measured the
average latency and jitter for Ethernet
frame sizes of 64, 128, 256, 512, 1,024,
1,280 and 1,518 bytes. Latency was
measured using the “cut-through”
measured the average latency and its
standard deviation — a statistical
method of calculating how much the
latency of a set of received packets varies
from the mean. Engineers measured the
average latency and jitter for Ethernet
frame sizes of 64, 128, 256, 512, 1,024,
1,280 and 1,518 bytes. Latency was
measured using the “cut-through”
method. Tests yielded impressive results
of between 8 and 24 microseconds of
average latency, and the same for stan-
dard deviation. These results demon-
strate that ERS 4500s in an eight-switch
stack configuration deliver very low
latency and standard deviation.
of between 8 and 24 microseconds of
average latency, and the same for stan-
dard deviation. These results demon-
strate that ERS 4500s in an eight-switch
stack configuration deliver very low
latency and standard deviation.
In summary
When put to the test, an eight-stack
configuration of 4548GT 4548GT-PWR
Ethernet Routing Switches demon-
strated superior performance of 320
Gbps full-duplex switching capacity for
all Ethernet frame sizes of 64 through
1,518 bytes. When the same configura-
tion was tested for zero frame loss toler-
ance across all 160 ports at the same
frame sizes, tests verified the highest
possible throughput — 100 percent.
The same exceptional performance was
achieved when 238 million 64-byte
frames per second were sent across the
stack with no packets being dropped.
Finally, tests demonstrated that the ERS
4500 Series delivers the low latency and
jitter required for enterprises running
VoIP and other converged applications
across the network.
configuration of 4548GT 4548GT-PWR
Ethernet Routing Switches demon-
strated superior performance of 320
Gbps full-duplex switching capacity for
all Ethernet frame sizes of 64 through
1,518 bytes. When the same configura-
tion was tested for zero frame loss toler-
ance across all 160 ports at the same
frame sizes, tests verified the highest
possible throughput — 100 percent.
The same exceptional performance was
achieved when 238 million 64-byte
frames per second were sent across the
stack with no packets being dropped.
Finally, tests demonstrated that the ERS
4500 Series delivers the low latency and
jitter required for enterprises running
VoIP and other converged applications
across the network.
100
75
50
25
0
Ethernet frame sizes (bytes)
Thr
oughput (%)
ERS 4548GT/4548GT-PWR
64 128 256 512 1,024
1,280
1,518
Figure 3. Nortel Ethernet Routing Switch 4500 Series throughput (%) test results
(eight-switch stack configuration)
25
20
15
10
5
0
Ethernet frame sizes (bytes)
Jit
ter (
us
ec
)
ERS 4548GT/4548GT-PWR
64 128 256 512 1,024
1,280
1,518
Figure 4. Nortel Ethernet Routing Switch 4500 Series Jitter (usec) test results
(eight-switch stack configuration)
Ethernet Routing Switch
4500 Series highlights
Scalable — Accommodates stacking
of up to eight units for a maximum of
400 ports per stack
of up to eight units for a maximum of
400 ports per stack
Flexible — Includes Fast Ethernet and
Gigabit Ethernet models with
100BaseFX fiber connectivity*
Gigabit Ethernet models with
100BaseFX fiber connectivity*
Resilient — Offers fail-safe stacking and
link aggregation (802.3ad/MLT/DMLT)
for improved resiliency and bandwidth
aggregation
link aggregation (802.3ad/MLT/DMLT)
for improved resiliency and bandwidth
aggregation
Convergence-ready — Includes Power
over Ethernet models and Quality of
Service support to ensure timely
arrival of delay-sensitive data
over Ethernet models and Quality of
Service support to ensure timely
arrival of delay-sensitive data
Dynamic power management —
Enables ports to be configured for
priority — low, high and critical — for
improved PoE control
Enables ports to be configured for
priority — low, high and critical — for
improved PoE control
* The 100FX SFP is only supported on ERS
4526FX, ERS 4550T and 4550T-PWR.