ZyXEL Communications P-870HN-5xb User Manual page 79

Table 12 DSL PTM Interface Configuration (continued)
LABEL
Service Category
Peak Cell Rate Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find
Sustainable
Cell Rate
Maximum
Burst Size
Select
Connection Mode
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P-870HN-5xb User's Guide
DESCRIPTION
Select UBR Without PCR or UBR With PCR for applications that are
non-time sensitive, such as e-mail.
Select CBR (Continuous Bit Rate) to specify fixed (always-on)
bandwidth for voice or data traffic.
Select Realtime VBR (real-time Variable Bit Rate) for applications
with bursty connections that require closely controlled delay and delay
variation.
Select Non Realtime VBR (non real-time Variable Bit Rate) for
connections that do not require closely controlled delay and delay
variation.
the Peak Cell Rate (PCR). This is the maximum rate at which the
sender can send cells. Type the PCR here.
This field is not available when you select UBR Without PCR.
The Sustain Cell Rate (SCR) sets the average cell rate (long-term) that
can be transmitted. Type the SCR, which must be less than the PCR.
Note that system default is 0 cells/sec.
This field is available only when you select Non Realtime VBR or
Realtime VBR.
Maximum Burst Size (MBS) refers to the maximum number of cells
that can be sent at the peak rate. Type the MBS, which is less than
65535.
This field is available only when you select Non Realtime VBR or
Realtime VBR.
Select Default Mode to allow only one WAN service over a single
virtual circuit.
Select VLAN MUX Mode to allow multiplexing of multiple protocols
over a single virtual circuit. You need to assign a VLAN ID and priority
level to traffic through each WAN connection. All WAN connections
share one MAC address.
This field is not available if you select PPPoA or IPoA as the DSL link
type. The Device uses Default Mode automatically for PPPoA or
IPoA.
Click this button to return to the previous screen without saving any
changes.
Click this button to save your changes and go back to the previous
screen.
Chapter 5 WAN Setup
79