SOCIETA’ ITALIANA COSTRUZIONI ELETTRONICHE S.r.l.
VIA TAZIO NUVOLARI, n° 53 - 55061 CARRAIA - (LU)
W e b s i t e : w w w . s i c e t e l e c o m. i t
ISCRIZ. TRIBUNALE LUCCA N. 8661 - C.C.I.A.A. N. 103668
P. IVA 00871160461 - Tel. 0583 980787 - Fax 0583 981495
E - M a i l : i n f o @ s i c e t e l e c o m. i t
Figure 2-7: Ethernet Interface window
QoS Settings:
QoS Management is implemented to assign different types of traffic to the
four priority queues (0 to 3) available on the system:
o
Queue 0 (highest priority)
o
Queue 3 (lowest priority)
Two different types of management of the priority are supported:
- by Class of Service (CoS): the Ethernet frames are queued in the four available
queues supported by the system according to the PCP (Priority Code Point) field of
the frame. (8 CoS classes (0-7)).
- By Differentiated Services Code Point (DSCP): the Ethernet frames are queued in
the four available queues supported by the system according to the DSCP field of
the frame (64 DSCP Classes (0 to 63)). DSCP priority management applies only to
IP packets.
Therefore by setting the QoS Key field it is possible to select one of the following modes of
operation:
o
without QoS (disabled)
o
with priority according to CoS (CoS).
o
with priority according to DSCP (DSCP).
The association between the CoS or DSCP values and the Priority Queue is defined by the
operator in the Queues Mapping lists.
The parameters relevant to the management of the QoS are displayed and can be modified
entering the new values. The new configuration is executed only when the <Apply> button
at the bottom of the area is pressed.
Note:
if the system has to carry TDM traffic it is generally recommended to enable QoS
using CoS key and assign only PCP 7 (related to TDM) to the highest priority queue.
All parameters are defined in Table 2.7 and 2.8.
