User guide

To explicitly configure G704 framing, include the framing statement at the [edit interfaces

interface-name e1-options] hierarchy level, specifying the g704 option:

[edit interfaces interface-name e1-options]

framing g704;

By default, G704 framing uses CRC4. To explicitly configure an interface’s G704 framing

to not use CRC4, include the framing statement at the [edit interfaces interface-name

e1-options] hierarchy level, specifying the g704-no-crc4 option:

[edit interfaces interface-name e1-options]

framing g704-no-crc4;

Documentation

framing on page 46•

Configuring the E1 Idle Cycle Flag

By default, an E1 interface transmits the value 0x7E in the idle cycles. To have the interface

transmit the value 0xFF (all ones) instead, include the idle-cycle-flag statement at the

[edit interfaces interface-name e1-options] hierarchy level, specifying the ones option:

[edit interfaces interface-name e1-options]

idle-cycle-flag ones;

To explicitly configure the default value of 0x7E, include the idle-cycle-flag statement

with the flags option:

[edit interfaces interface-name e1-options]

idle-cycle-flag flags;

Documentation

idle-cycle-flag on page 47•

Configuring E1 Data Inversion

By default, data inversion is disabled. To enable data inversion at the HDLC level, include

the invert-data statement at the [edit interfaces interface-name e1-options] hierarchy

level:

[edit interfaces interface-name e1-options]

invert-data;

When you enable data inversion, all data bits in the data stream are transmitted inverted;

that is, zeroes are transmitted as ones and ones as zeroes. Data inversion is normally

used only in AMI mode to guarantee ones density in the transmitted stream.

Documentation

invert-data on page 48•

Configuring E1 Loopback Capability

You can configure loopback capability between the local E1 interface and the remote

channel service unit (CSU), as shown in Figure 1 on page 11. You can configure the

E1 Interfaces Feature Guide for Routing Devices