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Chapter 1 Introduction Installation and Operation Manual

1-20 Functional Description Egate-100 Ver. 4.0

802.1D Tag Protocol Type

81 00

user_priority

CFI = 0

VID

8654 18 1

Priority

VLAN ID

Figure

1-13. VLAN Tag Format (802.1)

Untagged frames are tagged by the Egate PVID. VLAN priority is set to 0 in this

case, and the frame is mapped accordingly.

In the case of tag stacking, the original VLAN priority is copied to the new VLAN

and the frame is mapped according to this value.

Flooding

The user can choose how to map each one of the following frame types:

• Multicasts

• Broadcasts

• Unknown unicasts.

Encapsulation

GFP

Egate-100 supports the following two types of GFP:

• GFP single (non-VCAT, non-LCAS)

• GFP (multi) VCAT LCAS

GFP Single

Up to 63/84 E1/T1 remotes over single E1/T1 can be supported using Ethernet

over GFP encapsulation. The GFP is as defined in ITU-T G.7041 and ITU-T G.8040

and, for virtual concatenation VCAT header only (as non-LCAS transmitter), in

ITU-T G.7043.

GFP VCAT LCAS

Up to 42 E1/T1 remotes over up to 16 E1/T1 links can be supported using

Ethernet over GFP VCAT encapsulation as defined in ITU-T G.8040. The links are

grouped using VCAT as defined in ITU-T G.7043. The LCAS protocol is supported

as defined in ITU-T G.7042.

The important features of these NG-PDH standards are:

• Up to 42 Virtual Concatenation Groups (VCGs) are supported

• LCAS mechanisms that:

 Ensure that traffic flow recovers quickly from E1/T1 link failures

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