ZyXEL Communications SLC1224, Руководство пользователя

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SLC1224 User’s Guide
Chapter 3 G.SHDSL Port Setup 45
3.12 G.SHDSL Profile Setup
A profile is a list of settings that you define. Then you can assign them to one or more
individual ports.
1 Click Port Setup in the navigation panel and then the G.SHDSL line card’s link to open
the card’s Port Setup screen.
2 Click the Profile Setup link in the SLC Port Setup screen to go to the card's Profile
Setup screen.
Encap. Select the encapsulation type ( LLC or VC ) for this port.
AAL The SLC supports ATM Adaptation Layer 5.
Class Select cbr (constant bit rate) to specify fixed (always-on) bandwidth for voice or
data traffic.
Select
ubr (unspecified bit rate) for applications that are non-time sensitive, such
as e-mail.
Select
vbr (variable bit rate) for bursty traffic and bandwidth sharing with other
applications.
PCR Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the Peak Cell
Rate (PCR).
This is the maximum rate at which the sender can send cells. PCR applies with all
of the ATM traffic classes. Type the PCR here.
CDVT Cell Delay Variation Tolerance (CDVT) is the accepted tolerance of the difference
between a cell’s transfer delay and the expected transfer delay. CDVT applies with
all of the ATM traffic classes. Type the CDVT here.
SCR/MCR 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
class.
BT/NRM Burst Tolerance (BT) sets a maximum number of cells that the port is guaranteed
to handle without any discards. Type the BT here. BT applies with the vbr traffic
class.
Apply Click Apply to save your changes back to the line card.
Reset Click Reset to begin configuring this screen afresh.
Table 12 Add VC Profile (continued)
LABEL DESCRIPTION