Quidway® NetEngine 40 Series Universal Switching Router Route Switching Units
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The SRU consists of main processing unit (MPU), switching fabric unit (Fabric) and clock
module (CLK). As the core of system control and management, SRU also serves as system
clock source and maintenance and management unit. It implements the functions of the
control plane, switching plane and system maintenance plane.
Below follows a description of functions.
I. MPU
z
Process routing protocols, generate and sent forwarding tables to line
boards.
z
Conduct system management and performance monitoring as commanded
and feed back the information of system running to the operator.
z
Monitor and maintain the running of LPU.
z
Monitor and maintain the running of Fabric and CLK.
z
Monitor the running of the fan system and power system.
II. Fabric
z
Support non-blocking and automatic routing data exchange.
z
Support dynamic sharing of output buffer.
z
Support multi-priority switching.
z
Support multicast switching.
z
Support hardware flow control and back pressure.
z
The temperature sensor tests the temperature of the SRU. It can also collect
and report temperature information and generate related alarms.
III. CLK
z
Provide a standard level-3 synchronization clock with the clock reference
source (2048 Kbit/s or 2048 KHz).
z
Support clock priority.
z
Have four working modes: fast tracking, normal (tracking), hold and free-run.
z
Have rough tune and fine tune function, realizing on-site frequency
adjustment.
z
Enable synchronization performance detection, alarming and control.
Specifications
At present, the NE40 provides three types of SRUs, including CR-SRUB, CR-SRUC and
CR-SRUE.
Compared with first-generation SRUs of CR-SRUB and CR-SRUC, CR-SRUE demonstrates
much better performance. CR-SRUB and CR-SRUE are applicable to NE40-8, NE40-4 and
NE40-2, while the CR-SRUC is only applicable to NE40-2.
In addition, the CR-SRUE provides 10/100/1000 Mbps Ethernet interface while CR-SRUB and
CR-SRUC provide 10/100 Mbps Ethernet interface.
