342-86400-498PS
Issue 1.2
April 2012
Page 145
Copyright
GE Multilin Inc. 2010-2012
Frame Latency
Latency was measured based on cut-through time between two ETHER-1000
units in various configurations. Typical results are shown below.
Between two 1000 Mb/s ports:
SONET
Bandwidth
Frame Size
64 bytes
512 bytes
1518 bytes
Different sites,
no through-
nodes
24 x STS-1
35
s
52
s
90
s
12 x STS-1
40
s
63
s
114
s
6 x STS-1
52
s
87
s
166
s
4 x STS-1
66
s
113
s
219
s
Different sites,
one through-
node
24 x STS-1
20
s
34
s
65
s
12 x STS-1
23
s
40
s
77
s
6 x STS-1
29
s
52
s
103
s
4 x STS-1
36
s
65
s
130
s
Same unit
2.5
s
6
s
14
s
Between two 100 Mb/s ports:
SONET
Bandwidth
Frame Size
64 bytes
512 bytes
1518 bytes
Different sites,
no through-
nodes
24 x STS-1
42
s
92
s
201
s
12 x STS-1
48
s
103
s
227
s
6 x STS-1
60
s
127
s
278
s
4 x STS-1
74
s
153
s
331
s
Different sites,
one through-
node
24 x STS-1
28
s
74
s
177
s
12 x STS-1
31
s
80
s
190
s
6 x STS-1
37
s
92
s
216
s
4 x STS-1
44
s
105
s
242
s
Same unit
(local-to-local)
10
s
46
s
126
s
GMII Port’s Throughput Performance
For 64 byte frames:
93.3% (of wire-speed GigE rate)
For 1518 byte frames:
99.6% (of wire-speed GigE rate)
For random frame lengths:
99.3% (of wire-speed GigE rate)