Installation and Operation Manual Chapter 1 Introduction
ASMi-54 Ver. 1.0 Overview 1-3
WAN Protocol
ASMi-54 supports EFM.
PCS and PME
ASMi-54 follows EFM naming conventions:
• DSL pairs are called PME (Physical Medium Entity)
• A group of pairs (up to four in ASMi-54) is called PCS (Physical Coding
Sublayer).
The total bandwidth of the PCS port (the WAN direction) equals the sum of the
bandwidths of its underlying PME lines. The maximum rate of a single PME is
5696000, and the maximum bandwidth of the PCS port is 22784000 bps
(4 × 5696000).
Bridging
ASMi-54 provides a bridging function between the various bridge ports:
• Fast Ethernet ports
• Internal host.
The internal bridge operates in VLAN-Unaware or VLAN-Aware modes.
The VLAN-Aware bridge mode allows the user to create a subgroup of bridge
ports within the bridge. Each subgroup is associated with a unique VLAN Identifier
(VID). Frames can be forwarded only between bridge ports that are members of
the same VLAN, enabling a total separation between different VLAN users within
the same bridge.
In VLAN-Unaware bridge mode, the bridge ignores VLAN tags and forwards
frames only according to their source and destination MAC addresses.
ASMi-54 supports QoS mapping from bridge ports and Ethernet VLAN priority,
VLAN stacking/stripping per bridge port, ingress and egress.
Quality of Service
ASMi-54 supports Quality of Service (QoS) on DSL egress direction. Classification
is according to VLAN priority (802.1p), DSCP (bits 0-5 in IP TOS byte) and port
based. Mapping classification results into four transmit priority queues with strict
priority.
Fault Propagation
When the Network > User Fault Propagation feature is enabled, the LAN ports are
deactivated when the PCS uplink goes down. They will come up again once the
PCS port is resynchronized.
Management
ASMi-54 can be managed via:
• RS-232 craft port
• An inband management channel via Ethernet or PCS port (with or without
dedicated VLAN encapsulation).
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