Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 400

Configuration Commands
e3
Syntax e3 sonet-sdh-index
Context config>port>tdm
Description This command enables the context to configure E-3 parameters. E-3 lines provide a speed of 44.736
Mbps and is also frequently used by service providers. E-3 lines carry 16 E-1 signals with a data rate
of 34.368 Mbps.
A E-3 connection typically supports data rates of about 43 Mbps. A E-3 line actually consists of 672
individual channels, each supporting 64 Kbps. E-3 lines are used mainly by Service Providers to
connect to the Internet backbone and for the backbone itself.
Depending on the MDA type, the E-3 parameters must be disabled if clear channel is enabled by
default (for example, on the m12-ds3e3 MDA). Clear channel is a channel that uses out-of-band
signaling, not in-band signaling, so the channel's entire bit rate is available. Channelization must be
explicitly specified. Note that if E-3 nodes are provisioned on the channelized SONET/SDH MDA
you must provision the parent STS-1 SONET/STM0 SDH path first.
North America uses the T-Carrier system while Europe uses the E-Carrier system of transmission,
using multiples of the DS system. Digital signals are carried inside the carrier systems.
The no form of this command disables E-3 capabilities.
bert
Syntax bert {2e3|2e9|2e11|2e15|2e20|2e20q|2e23|ones|zeros|alternating} duration duration
no bert
Context config>port>tdm>ds1
config>port>tdm>ds3
config>port>tdm>e1
config>port>tdm>e3
Description
This command initiates or restarts a Bit Error Rate Test (BERT) on the associated DS-1/E-1 or DS-3/
E-3 circuit.
The associated DS-1, E-1, DS-3, or E-3 must be in a shutdown (admin down) state to initiate this test.
The no form of the command terminates the BERT test if it has not yet completed.
Notes:
Default
2e3
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• This command is not saved in the router configuration between boots.
• The 4-port OC-3/STM-1 and the 1-port OC-12/STM-4 ASAP MDA supports up to 28 concur-
rent BERT tests per MDA. The 4-port and 12-port DS-3/E-3 ASAP MDAs support a single
BERT test per MDA. An attempt to configure more BERT tests can result in an error indicating
an operation failure due to resource exhaustion.
• If the ASAP MDA BERT error insertion rate command is executed when tests are running, it
will not take effect until test is restarted.
7750 SR OS Interface Configuration Guide