Chapter 1 Introducing the GLC1320G-55

SFP Slots

Install SFP (Small Form-factor Pluggable) transceivers to connect to Ethernet switches.

Discovery and Dependency Mapping Inventory (DDMI)

Discovery and Dependency Mapping Inventory (DDMI) reads the transceiver temperature and voltage.

SFP/CSFP Tx Manual Power Disable

Manually disables the transfer (Tx) power of individual transceivers.

Subnet Based VLAN

Subnet based VLAN allows you to group traffic into logical VLANs based on the source IP subnet you specify. When a frame is received on a port, the GLC1320G-55 checks if a tag is added already and the IP subnet it came from. The untagged packets from the same IP subnet are then placed in the same subnet based VLAN. One advantage of using subnet based VLANs is that priority can be assigned to traffic from the same IP subnet.

xVLAN

xVLAN changes the VLAN IDs (VIDs) of subscriber traffic before sending it to the service provider’s network. It also changes the VIDs of traffic from the service provider’s network before sending it to the subscriber. This lets you use unique VLANs for each subscriber but still deploy all the CPE devices with the same VLAN configuration.

Upstream Broadcast Storm Control

Broadcast storm control lets you set limits for how many broadcast, multicast and destination lookup failure (DLF) packets a port receives per second from the subscriber.

Downstream Broadcast VLAN Control

Downstream broadcast VLAN control allows you to block downstream broadcast packets from being sent to specified VLANs on specified ports. This helps to reduce downstream bandwidth requirements on a subscriber line.

MAC Count Limit

You can limit the number of MAC addresses that may be dynamically learned on a port. You may enable/disable the MAC count filter on individual ports.

Rate Limiting

Rate limiting on the subscriber ports allows service providers to offer tiered service in increments of 64 Kbps. This service differentiation is not only to fulfill the needs of different customers, but also to provide a network infrastructure that combines guaranteed performance and flexibility in service provisioning.

8

 

GLC1320G-55 User’s Guide