Alcatel-Lucent 7750 Configuration Manual page 480

Interfaces
Context config>port>tdm
Description This command enables the context to configure DS-3 parameters. DS-3 lines provide a speed of 44.736
Mbps and is also frequently used by service providers. DS-3 lines carry 28 DS-1 signals and a 44.736 Mbps
data rate.
A DS-3 connection typically supports data rates of about 43 Mbps. A T-3 line actually consists of 672 indi-
vidual channels, each supporting 64 Kbps. T-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 DS-3 parameters must be disabled if clear channel is enabled by default
(for example, on the m12-ds3 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 DS-3 nodes are provisioned on a 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 DS-3 capabilities.
Default none
Parameters sonet-sdh-index — Specifies the components making up the specified SONET/SDH Path. Depending on the
type of SONET/SDH port the sonet-sdh-index must specify more path indexes to specify the payload
location of the path. The sonet-sdh-index differs for SONET and SDH ports.
e1
Syntax e1 [e1-id]
Context config>port>tdm
Description This command enables the context to configure E-1 parameters. E-1 is a basic time division multiplexing
scheme used to carry digital circuits. It is also a standard WAN digital communication format designed to
operate over copper facilities at a rate of 2.048 Mbps.
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-1 capabilities.
Default
none
Parameters e1-id — Specifies the E-1 channel being created.
Values
e3
Syntax e3 sonet-sdh-index
Context config>port>tdm
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7750 SR Interface Configuration Guide