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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:
• 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
7710 SR OS Interface Configuration Guide
Interface Configuration
Page 285
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