Verilink Access Manager 2000 (896-502037-001) Product Manua Uživatelský manuál stáhnout pdf (Strana 192)

Configuring the T1 Network

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Access Manager 2000 User Manual

■ the signal received from the network is looped back to the network

(ESS) as a keep-alive when a loss of signal (LOS) is detected on the

incoming signal from the EQP.

The default setting for this option is YES (AIS keep-alive).

This option determines the mode of operation of the local BER alarm.

When this option is set to NO (default setting), the alarm indicator on the

CSU clears when the alarm condition clears.

If this option is set to YES, the local alarm indicator stays on after the

condition clears, until the alarm cutoff (ACO) button is pressed.

If the ACO button is pressed while the alarm condition still exists, the

ACO LED and function activate, but the alarm LED remains lit. When the

alarm condition clears, the alarm clears and the ACO LED goes off.

When this option is enabled (YES), it allows automatic transmission of

Performance Report Messages (PRMs) defined by ANSI T1.403-1989.

The PRM transmits the last four seconds of performance data every

second on the ESF Data Link for use by Telco monitoring equipment.

Enable this option only when the use of PRMs is required. The default

setting is NO.

The Encode option controls the transmit direction to the NET, and the

Decode option controls the receive direction from the NET. These

options are both defaulted to NO, which selects AMI line coding.

To select B8ZS coding on the NET, set both options to YES. These two

options are combined in the 4016 List 1. If you enter YES, then the CSU

encodes the signal to the NET and decodes the signal from the NET.

This option determines whether the CSU circuit element generates a new

CRC-6 code toward the NET or passes the incoming CRC-6 code from

the EQP to the NET.

To pass the incoming CRC-6 bits from the EQP to the network, set this

option to NO (disable CRC regeneration when the EQP generates the

CRC-6 code).

Enable Alarm

Latch

Enable PRM

Enable Span Side

B8ZS Encode and

Decode

Regenerate CRC to

Span Side

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Verilink Access Manager 2000 (896-502037-001) Product Manua Uživatelský manuál Strana 192