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User Manual
COGE5, COGE5-F
page 38 of 110 © KEYMILE December 2015 EN/LZTBU 372 144/3 RA
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Functional Description
The traffic ports support Ethernet frames bigger than 1522 bytes called
jumbo frames. The maximum frame length supported is 9’216 octets (refer
also to section
8.3 AP: / unit-x / port-a (on page 76)).
Any of the five traffic ports can be used for inband management communica-
tions or as a dedicated (untagged) management port by configuring the port
VLAN-ID to the management VLAN-ID.
The internal ports (GbE star) connecting the service units are used in two
applications:
• Connection of an Ethernet service unit participating in the XMC20 Switch.
In this case the port has a fixed configuration, except the queue handling
(MTU sizes and queue scheduling).
• Connection of a service unit not participating in the XMC20 Switch. In this
case the internal port offers the same amount of configuration parameters
as an external port, except the link speed and duplex mode.
A service unit not participating in the XMC20 Switch can e.g. provide
access to the Ethernet over PDH (EoP) or Ethernet over SDH (EoS)
transport facilities.
Please note:
The switch device on the redundant COGE5 unit participates in the XMC20
Switch.
5.2.2 Management Ports
Please refer to section 5.1.3 Management Traffic and Routing (on page 32).
5.2.3 Mirror Ports
Any of the five Ethernet front ports of the COGE5 unit, and any other Ether-
net port of the XMC20 Switch, can be configured to be a mirror port. In this
case, frames from any other front port can be copied to this port.
For the port to be mirrored, you can select the direction, i.e. ingress frames,
egress frames, or both.
For more information please refer to [302] User Guide “XMC25/XMC23/
XMC22” .
5.2.4 Synchronization Interface
This interface is implemented by means of a micro D-Sub connector. It pro-
vides two symmetrical clock signal inputs of 2.048 MHz with an impedance
of 120 Ohms according to ITU-T G.703 (esi-1 and esi-2) or high impedance,
and two symmetrical clock signal outputs of 2.048 MHz with an impedance
of 120 Ohms (eso-1 and eso-2) or high impedance.
The impedance of the input interface, 120 Ohms or high impedance, can be
determined by a jumper on the board. High impedance is necessary when a
redundant COGE5 is placed in slot 13. In this case, you can connect a syn-
chronization source to two COGE5 synchronization input interfaces in paral-
lel (e.g. to both esi-1 on unit-11 and esi-1 on unit-13). When using an exter-