APC IP DSLAM Guía de usuario descargar pdf (Pagina 54)

EDA 1200 System Overview

4.3.3 ESN108

Ethernet switch ESN108 is a small-size 8-port switch. It

is installed the same way as the EDN312x IP DSLAMs,

that is, directly on a KRONE LSA PLUS and PROFIL rail.

Concentrating the Ethernet traffic from the IP DSLAM,

ESN108 provides eight 100 Mbps Fast Ethernet ports

and for uplink one Single Mode Fiber (SMF) 100/1000

Mbps auto-configurable Small Form Factor pluggable

SFP fiber port. ESN108 has built-in power over Ethernet

(PoE) for distributing power to the connected IP DSLAMs

via the Fast Ethernet ports.

Using the fiber uplink ESN108 may be aggregated into EFN324 (100 Mbps)

or ESN410 (1 Gbps).

Priority queues are used to guarantee the QoS needed for delay-sensitive

applications like voice (IP telephony), video conferencing, or video broadcast.

Each packet going through the switch can be assigned a queue priority

(according to IEEE 802.1Q).

ESN108 offers multicast loading of IP DSLAM software and multicast video

streaming by use of IGMP snooping. Listening to IGMP messages (Internet

Group Management Protocol messages), the ESN108 switch builds mapping

tables and associates forwarding filters. It dynamically configures the switch

ports to forward IP multicast traffic only to those ports associated with multicast

hosts.

By use of VLAN technology it is possible to create separate logical networks

within the Ethernet LAN. In the EDA 1200 solution, VLAN can be used to

separate traffic types or different services and to improve security. ESN108 is

transparent for VLAN IDs and offers port mapping filtering.

Rapid spanning tree protocol (RSTP) is implemented although the unit has only

one upstream interface. The use of RSTP is to take advantage of the protocol

for topology purposes. With the aid of the information in the protocol, a topology

map of nodes can be made up. Also, RSTP is needed in all nodes to prevent

prolonged convergence time for a new configuration.

1/1551-LZA 101 464-V1 Uen C 2009-12-17

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 66 67

Sin comentarios

APC IP DSLAM Guía de usuario Pagina 54