ZyXEL NetAtlas User Guide - Page 261
EPON Profile Configuration > Add ONU Profile > Set Logical Link
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Chapter 19 EPON Profile Configuration The following table describes the labels in this screen. Table 130 EPON Profile Configuration > Add ONU Profile > Set Logical Link LABEL DESCRIPTION Link Bridging Profile Select the name of the link bridging profile which applies to this link. ONU Upstream Queue Size Specify the queue size (in kilobyte) for the upstream traffic through this link. Each link contains one queue only. The number you entered is multiplied by 4. Upstream DBA Upstream traffic refers to traffic from the ONU to the OLT. Granting Mode Specify how the EMS allocates bandwidth to the link. Select Dynamic to let the EMS use DBA to re-assign unused bandwidth based on traffic requirements and link priority. Delay Select TDM and the EMS uses static, TDM-like bandwidth allocation. The predefined bandwidth is reserved whether the link uses it or not. Each link transmits data at a fixed rate during the available time slot. Time slot is a unit of duration in TDM (time division multiplexing) during which an ONU transmits to the EMS and vice versa. Each ONU takes turns to transmit when its time slot occurs. Specify the delay tolerance of a logical link for bandwidth allocation when network congestion occurs. Select Low for the packets to get serviced faster. This is recommended when you have real-time applications (such as VoIP) on the network. Select High to get less service time slots. Packets are serviced slower. Guaranteed Select the check box and specify the minimum upstream bandwidth Bandwidth guaranteed to this link. Maximum Bandwidth Clear the check box to set the minimum bandwidth to 0 and there is no limit on the minimum bandwidth committed to the link. Select the check box and specify the maximum upstream bandwidth this link can get. Maximum Burst Size TDM Rate Clear the check box to set the maximum bandwidth to 0 and there is no limit on the maximum bandwidth. Specify the maximum upstream burst size (in kilobyte) that a link is allowed to send for a single traffic burst. This assigns more bandwidth to the link for a short burst period without changing the profile settings. If you select TDM, enter how many 250 micro-second time frames are allowed to specify the time period in which a link can send data. TDM Grant Length The OLT provides a grant that 512 bytes can be issued every 250 microseconds, which is equivalent to a transmission rate of 2.048M byte per second. If you select TDM, enter the total number of frames the link can send in a time slot. NetAtlas EPON Manager User's Guide 261