Alcatel-Lucent 7750 Configuration Manual page 481

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 individ-
ual 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 cir-
cuit.
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:
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•
•
Default 2e3
Parameters duration — Sets the duration for the BERT test.
Values
ones — Sends an all ones pattern.
7750 SR Interface Configuration Guide
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 concurrent
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.
Up to 24 hours, in seconds or hh:mm:ss format
Interface Configuration
Page 481