Figure 24: Ether-1000 Priority Queues - GE JungleMUX SONET Technical Practice

Note: The frames being forwarded from the "LAN" to the "WAN" switch are
competing for the GMII port‟s "add" bandwidth (1 Gbps) based on their
EtherType / source priority designation. The frames being forwarded from the
"WAN" to the "LAN" switch are competing for the GMII port‟s "drop" bandwidth (1
Gbps) based on their mapping priority designation.
Figure 24 shows the priority queues. Note that, for the Line ports, only the
queues for one of the four TDM pipes are shown.
Egress
Frames are outputted with
their original size and priority
"LAN"
information preserved or with
optionally added/removed SWITCH
Q-tag (see Output Tagging
ON P/B
features). See NOTE below.
6-7
Egress
4-5
ETHERNET FRAME
2-3
0-1
to/from
Paddleboard
ET
Access Ports
6-7
4-5
ETHERNET FRAME
2-3
Ingress
0-1
Source Priority
• Value in 802.1p/Q priority field.
• Value in „TOS‟ field of IP frame.
• No priority („native‟ frame), in
which case the user-configurable
port's Default Priority is assumed.
• Forced to N (N=1...6)
NOTE: Selected EtherType frames
are using top-priority queue.
EtherType is set per port.

Figure 24: ETHER-1000 Priority Queues

There are 16 separate priority queues for each Line port‟s TDM pipe: 8 for the
"pass-thru" frames (designated as "+" queues) and 8 for the "add" frames
(designated as "-" queues). Which of the 8 available queues a frame is placed
into depends on its mapping priority (designated at its source ETHER-1000
paddleboard port).
through both left and right Line ports, while the unicast frames with known
destination are sent through one of the two Line ports only (based on which Line
port sees fewer ETHER-1000 hops to the destination).
The frames in the queue "7+" have the highest priority, those in "7-" have the
second highest priority, those in "6+" have the third highest priority, etc. Finally,
the frames in the queue "0-" have the lowest priority. The frames from higher
Copyright  GE Multilin Inc. 2010-2012
"WAN"
Queuing
SWITCH IN
At destination site, frames are
ETHER-1000
queued into 8 priority queues
UNIT
based on Mapping Priority
designated at source site.
7
GMII port
6
8
5
4
OUTPUT
PRIORITY
3
QUEUES
2
1
0
FRAME BUFFER
Mapping Priority Routing
(assigned for use within JMUX) Selection of TDM
=7 for selct'd EtherType frames. pipe is based on
For other frames, may be set source port's
(per port) for: D-PVLAN setting.
• Source Priority (with 76)
Selection of Line
• Forced to N (N=1...6).
port (L or R) is
based on minimum
[Forcing Mapping Priority forces number of hops to
Source Priority to same value.] destination.
Note that each broadcast/multicast "add" frame is sent
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Issue 1.2
April 2012
Page 36
7+
7-
6+
6-
16
5+
5-
OUTPUT
4+
4-
PRIORITY
3+
QUEUES
3-
2+
(PER TDM
2-
PIPE)
1+
1-
0+
0-
FRAME BUFFER
7+
7-
6+
16
6-
5+
5-
OUTPUT
4+
PRIORITY
4-
3+
QUEUES
3-
(PER TDM
2+
2-
PIPE)
1+
1-
0+
0-
FRAME BUFFER
Queuing
Higher priority and
NOTE: Any tagged "EtherType" frames are
"Pass-thru" frames
outputted with 802.1p/Q priority set to 7.
NOTE: The "LAN" switch has
Any tagged frames whose Mapping Priority
with same priority
common ingress and egress
was forced to N are outputted
are mapped first.
queues (total 4).
with 802.1p/Q priority set to N.
Egress
to/from
Left
Line Port
Ingress
Egress
to/from
Right
Line Port
Ingress