Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 150 / 2536

363-206-285
Applications
2-68 Issue 3 June 2001
DS3 Transmultiplexer (TMUX) Application. 2
The transmultiplexing feature provides an economical means for collection of
DS1s at a customer site, and handoff of a fully groomed asynchronous DS3 to the
interexchange carrier without the need for external M13 multiplexers.
Figure 2-46 shows an example of a total of 28 DS1s connected to three NEs and
transported on three different STS-1s. The DS1s are collected and groomed in the
DDM-2000 OC-3 shelf on the right, multiplexed to a DS3, and then passed on to
the interexchange carrier. The DS3 Transmultiplexer (TMUX) circuit pack provides
this feature.
In the transmit direction the TMUX accepts one DS3 signal and demultiplexes it
into 28 DS1s. Performance monitoring can then be performed on the DS1s before
they are mapped into floating VT1.5s. The 28 VT1.5s are then multiplexed into
STS-1s before being sent to the high-speed OLIU. In the receive direction the
reverse process takes place. The TMUX circuit pack also provides enhanced DS3
performance monitoring as well as DS1, VT, and STS-1 PM.
Figure 2-46. DS3 Transmultiplexer Application
DDM-2000
OC-3
DDM-2000
OC-3
tpa 852317/01
DS1s that form DS3 can come from multiple STS-1s
7 DS1s on STS-1 #1 to IEC
OC-3/12
Path Switched Ring
10 DS1s on
STS-1 #2 to IEC
Transmux CPs are
only required here!
DS3 & Individual DS1
Terminal & Facility
Loopbacks Provided
1 DS3 to IEC
11 DS1s on STS-1 #3 to IEC
DDM-2000
OC-3
DDM-2000
OC-3