Extreme Networks Alpine 3802, Hardware Manual

Page: 168 / 352

168 Extreme Networks Consolidated Hardware Guide
Alpine 3800 Series I/O Modules
GM-16X
3
Module
Figure 79 shows the GM-16X 3 module.
Figure 79: GM-16X 3 module
The GM-16X 3 module has 16 1000BASE-X ports using mini-GBIC (or small form factor pluggable (SFP))
slots.
The GM-16X 3 ports are oversubscribed 4:1 to the Alpine backplane. The module has four groups of four
ports each. Each group multiplexes traffic into a single full duplex gigabit link to the switch fabric.
To take advantage of this architecture, use a single port in each group before using all of the ports in
any particular group. Table 48 lists the port groups for the GM-16X
3 module.
Populate ports 1, 5, 9, and 13, then ports 2, 6, 10, and 14, followed by ports 3, 7, 11, and 15, and finally
ports 4, 8, 12, and 16.
NOTE
If congestion is detected on a port with flow control enabled, a flow control PAUSE frame is sent out
that port. The PAUSE frame is not sent out on the other ports in the group.
Table 49 lists the number of GM-16X 3 modules that you can install in an Alpine chassis.
Table 48: GM-16X 3 port groups
Ports Group
1, 2, 3, 4 1
5, 6, 7, 8 2
9, 10, 11, 12 3
13, 14, 15, 16 4
Table 49: GM-16X
3
configurations supported
Chassis GM-16X 3 Modules
Alpine 3802 1 (or 1 GM-16T
3
module),
installed in slot 1 or slot 2 only
Alpine 3804 4
Alpine 3808 8
GM16X3
Port status LEDs
Module
status LED
Mini-GBIC ports