Connection Types; Pppoa - ZyXEL Communications P-663HN-51 User Manual

Chapter 5 WAN Setup
Table 13 Advanced Setup > WAN > Add (continued)
LABEL
Service Category
Peak Cell Rate
Sustainable
Cell Rate
Maximum
Burst Size
Enable Quality of
Service
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5.5 Connection Types

Be sure to use the connection type required by your ISP. Here is background
information on the connection types the ZyXEL Device supports.

5.5.1 PPPoA

PPPoA stands for Point to Point Protocol over ATM Adaptation Layer 5 (AAL5). A
PPPoA connection functions like a dial-up Internet connection. The ZyXEL Device
encapsulates the PPP session based on RFC1483 and sends it through an ATM PVC
(Permanent Virtual Circuit) to the Internet Service Provider's (ISP) DSLAM (digital
access multiplexer). Please refer to RFC 2364 for more information on PPPoA.
Refer to RFC 1661 for more information on PPP.
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DESCRIPTION
Select UBR (unspecified bit rate) for applications that are non-time
sensitive, such as e-mail. Use it with PCR if you want to specify a
maximum rate at which the sender can send cells.
Select CBR (constant bit rate) to specify fixed (always-on) bandwidth
for voice or data traffic.
Select Realtime VBR for bursty traffic connections that require
closely controlled delay and delay variation (like video conferencing).
Use Non Realtime VBR for bursty connections that do not require
closely controlled delay and delay variation (like non-time sensitive
data file transfers).
The Peak Cell Rate (PCR) is the maximum rate at which the sender
can send cells. PCR applies with all of the ATM traffic classes. Type a
number of (ATM) cells per second (1~255000).
The Sustained Cell Rate (SCR) sets the average cell rate (long-term)
that can be transmitted. Type the SCR, which must be less than the
PCR. SCR applies with the VBR traffic classes. Type a number of
(ATM) cells per second. The SCR must be less than the PCR.
The Maximum Burst Size (MBS) sets the maximum number of cells
that the port should handle without any discards. Type the MBS here
(1~1000000). MBS applies with the VBR traffic classes.
Enable the (packet level) QoS if you need to provide improved
performance for certain classes of applications (like VoIP or video
conferencing).
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P-663HN-51 User's Guide