Specifications

Chapter 1 Introduction Installation and Operation Manual
1-2 Overview MiRICi-E3T3 Ver. 2.2
Features
MiRICi-E3T3 supports the following basic features:
• Framed or unframed for E3/T3 links
• Standard encapsulation via GFP, HDLC/cHDLC
• Management for configuration, status, and diagnostics.
• Hot-insertion SFP footprint, MSA compliant
• Full duplex wire-speed packet forwarding
• Configurable Tx clock source for Receive or Internal clock
• Visual fault indication:
 Loss of E3/T3 signal
 Loss of Ethernet link
• Product identification support
• Easy release mechanism
Additional features are described in the sections below.
Flow control
A flow control mechanism is activated when LAN traffic exceeds the WAN link’s
(E3/T3) capacity and the watermarks of the internal frame buffer. Pause packets
are transmitted to the LAN port, halting LAN traffic until the buffer has been
emptied to below the watermark limit.
Fault Propagation
In case of LOS and if Fault Propagation is enabled, the LAN link is automatically
disabled and the link status LED turns off. In addition, the LOS indication is
propagated towards the host by sending an electrical signal via the LOS pin on
the MSA edge connector. The LOS LED turns ON, visually indicating the LOS.
Quality of Service
The unit supports Quality of Service (QoS) with classification according to VLAN
priority (802.1p). Classification results are mapped into four transmit priority
queues with strict priority.
Loop Detection
MiRICi-E3T3 incorporates a mechanism that detects loops on the WAN or the LAN
side by transmitting special loop detection frames. When the unit recognizes that
a loop exists, preventative actions are performed. Refer to
Functional Description
for additional information.