Frame Latency; Gmii Port's Throughput Performance - GE JungleMUX SONET Technical Practice

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:
Bandwidth
Different sites, 24 x STS-1
no through-
12 x STS-1
nodes
Different sites, 24 x STS-1
one through-
12 x STS-1
node
Same unit
Between two 100 Mb/s ports:
Bandwidth
Different sites, 24 x STS-1
no through-
12 x STS-1
nodes
Different sites, 24 x STS-1
one through-
12 x STS-1
node
Same unit
(local-to-local)

GMII Port's Throughput Performance

For 64 byte frames:
For 1518 byte frames:
For random frame lengths:
Copyright  GE Multilin Inc. 2010-2012
SONET
64 bytes
35 s
40 s
52 s
6 x STS-1
66 s
4 x STS-1
20 s
23 s
29 s
6 x STS-1
36 s
4 x STS-1
2.5 s
SONET
64 bytes
42 s
48 s
60 s
6 x STS-1
74 s
4 x STS-1
28 s
31 s
37 s
6 x STS-1
44 s
4 x STS-1
10 s
93.3% (of wire-speed GigE rate)
99.6% (of wire-speed GigE rate)
99.3% (of wire-speed GigE rate)
342-86400-498PS
Issue 1.2
April 2012
Page 145
Frame Size
512 bytes 1518 bytes
52 s 90 s
63 s 114 s
87 s 166 s
113 s 219 s
34 s 65 s
40 s 77 s
52 s 103 s
65 s 130 s
6 s 14 s
Frame Size
512 bytes 1518 bytes
92 s 201 s
103 s 227 s
127 s 278 s
153 s 331 s
74 s 177 s
80 s 190 s
92 s 216 s
105 s 242 s
46 s 126 s