RAD Data comm 100 Especificações descarregar pdf (Página 56)

Chapter 1 Introduction Installation and Operation Manual

1-24 Functional Description Egate-100 Ver. 4.0

• For T1 links: PPS ~1.533Mbs / 8/ ( P_SIZE + Chec_O + Thec_O + Ehec_O +

P_FCS).

In Egate-100:

• Ehec_O is 0

• P_FCS is user-configurable.

Statistics

Statistics include:

• Tx underrun

• Transmitted correct frames

• Transmitted correct octets

• Received correct frames

• Received correct octets

• FCS errors (in GFP, RX_CRC32_ERROR).

In GFP encapsulation Egate-100 supports the following additional statistics:

• Link State (In sync / Out of sync)

• Rx GFP data Not Valid

• Rx Single Bit Corrected

• Rx_Thec_Multi_Error

• Rx_Ehec_Multi_Error.

HDLC

Up to 126 E1/T1 remotes over unframed or fractional E1/T1 can be supported

using Ethernet over HDLC encapsulation.

Synchronous HDLC protocol is a bit-oriented protocol, where data is transmitted

in frames. Each frame starts and ends with a flag (7E hex). All frames contain a

16-bit CRC field. Zero-bit insertion is used, to allow the contents of the frame to

be transparent. Zero-bit insertion means that a binary 0 is inserted after a

succession of five 1s within a frame (i.e., between flags).

Frame boundaries are defined by flags and all frames are transmitted with a

16-bit CRC.

The 32-bit LAN CRC is not transmitted over the E1/T1. No PPP or other headers

are added to the Ethernet frame with this encapsulation.

PPP/BCP

Up to 126 E1/T1 remotes over unframed or fractional E1/T1 can be supported

using Ethernet over PPP/BCP encapsulation, with an HDLC CRC of 16 bits. The LAN

FCS is stripped and not transmitted over the link.

The supported PPP/BCP protocols are:

• LCP (Line Control Protocol) as per RFC 1661

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RAD Data comm 100 Especificações Página 56