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