Zhone 4929 DSLAM 用户手册

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4929 DSLAM Installation and User’s Guide

4929-A2-ZN20-30

Port Mode Setting

Specify a port mode:

z

Fixed – The upstream and downstream rates 

are fixed.

z

Adaptive – The ports will automatically train 

up to the best possible speed supported by the 

DSLAM, the modem at the remote end, and 

the copper cable pair connecting the two. 

z

Fixed Adaptive – The ports will automatically 

train up to the best possible speed, subject to a 

user-specified maximum upstream and 

downstream bandwidth.

VPI/VCI Detect Setting

Specify the port behavior with regard to VPI/

VCI detection:

z

On – The DSLAM will monitor the line to 

determine the VPI and VCI settings of the 

remote ADSL modem and set itself 

accordingly. If no ATM cells are detected (at 

any VPI/VCI setting), the port will default to 

VPI 0 and VCI 35.

z

Off – The port will use the default setting of 

VPI and VCI (0/35 if not changed by the 

setting of VPI and VCI, below), or lock in the 

VPI/VCI already discovered while VPI/VCI 

detection was On. 

Data Rate Setting

If you have selected a Port Mode of Fixed or 

Fixed Adaptive, specify the maximum upstream 

and downstream rates, in bps.

Filter IP Address Settings Specify up to four IP address ranges. Packets are 

accepted from source IP addresses in the ranges 

specified. 

Protocol Setting

Click in the check box to enable Protocol Setting 

detection. Select Allow Selected and specify up 

to four Ethertypes allowed on the ports.

DHCP Option 82

Specify whether DHCP Option 82 is enabled, 

and if it is, whether packets are identified by IP 

address or circuit ID. This identifier is added to 

packets to let your DHCP Server recognize 

which DSLAM port an IP address request is 

coming from, thereby allowing the DHCP 

Server to limit the number of IP addresses 

assigned per port.

VPI and VCI

Specify a default VPI and VCI if VPI/VCI 

Detect Setting (above) is Off.