NEC Sl2100 Networking Manual page 119

ISSUE 1.0
13.5.5 Entering VLAN Settings for PC Port by Phone (Data Packets Only)
1. Press Hold, Transfer, *, # to enter programming mode.
2. Enter the user name of ADMIN and password of 6633222, then press the OK softkey.
3. Press 1 on the dial pad for Network Settings.
4. Press 1 or 2 to disable/enable the VLAN for the data packets. Press the OK soft key after the
setting is changed.
5. Press 3 on the dial pad for Port VLAN ID.
6. Enter a valid VLAN ID of 1~4094. Press the OK soft key after the setting is changed.
7. Press 4 on the dial pad for Port VLAN Priority.
8. Enter the VLAN priority of 0~7. Press the OK soft key after the setting is changed.
9. If no more changes are made, press the Exit soft key three times. Then press the Save soft key,
and the phone reboots.
13.6 ToS Settings (Layer 3 QoS)
The marking of packets at layer 3 is done by marking the ToS byte in the IP header of the voice
packet. The NEC SL2100 supports two methods for marking the ToS byte:
• IP precedence
• DSCP (Diffserv)
IP Precedence
IP Precedence uses the first 3 bits of the ToS field to give eight possible precedence values (0~7).
Under normal circumstances the higher the number the higher the priority. However this is left to the
network administrator for setup. The administrator may assign this in exactly the opposite manner with
the lower values having a higher priority. Below are the eight common values for IP precedence.
• 000 is an IP precedence value of 0, sometimes referred to as routine or best effort.
• 001 is an IP precedence value of 1, sometimes referred to as priority.
• 010 is an IP precedence value of 2, sometimes referred to as immediate.
• 011 is an IP precedence value of 3, sometimes referred to as flash.
• 100 is an IP precedence value of 4, sometimes referred to as flash override.
• 101 is an IP precedence value of 5, sometimes called critical.
• 110 is an IP precedence value of 6, sometimes called internetwork control.
• 111 is an IP precedence value of 7, sometimes called network control.
Working in conjunction with IP precedence, the next 4 bits in the ToS field are designed to influence
the delivery of data based on delay, throughput, reliability, and cost. However these fields are typically
not used.
The following table shows the 8-bit ToS field and the associated IP precedence bits.
IP Prece- IP Prece-
dence dence
1(on) here = 1(on) here =
value of 4 value of 2
Differential Services Code Point (DSCP)
DSCP stands for Differential Services Code Point (or Diffserv for short). It uses the first 6 bits of the
ToS field therefore giving 64 possible values.
The following list shows the most common DSCP code points with their binary values and their
associated names:
Networking Manual
IP Prece- Delay
dence
1(on) here =
value of 1
Through- Reliability
put
SL2100
Cost Not Used
9-21