Configuration Commands
Page 398 7750 SR OS Interface Configuration Guide
TDM Commands
tdm
Syntax tdm
Context config>port
Description This command enables the context to configure DS-1/E-1 and DS-3/E-3 parameters for a port on a
channelized MDA T1/E1. This context cannot be accessed on non-channelized MDAs.
TDM is a mechanism to divide the bandwidth of a stream into separate channels or time slots by
assigning each stream a different time slot in a set. TDM repeatedly transmits a fixed sequence of
time slots over a single transmission channel. Each individual data stream is reassembled at the
receiving end based on the timing.
Default None
ds1
Syntax [no] ds1 ds1-id
Context config>port>tdm
Description This command enables the context to configure digital signal level 1 (DS-1) frame parameters. The
T-Carrier system was the first successful system that supported digitized voice transmission. The
original transmission rate (1.544 Mbps) in the T-1 (DS-1) line is commonly used by Internet service
providers (ISPs) to connect to the Internet.
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.
T-1 transmits DS-1-formatted data at 1.544 Mbps through the network. The corresponding European
carrier is E-1 with a data rate of 2.048 Mbps. E-1 and T-1 (DS-1) can be interconnected for interna-
tional use.
The no form of this command disables DS-1 capabilities.
Default None
Parameters ds1-id — Identifies the DS-1 channel being created.
Values DS1: 1 — 28
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