Figure 38. Back-To-Back Terminal (Hub) Configuration - Alcatel 1850 TSS-320 Technical Handbook

3.2.3.3 Back-to-back terminal (Hub)
The Back-to-back terminal (Hub) is able to add and drop all the traffic (wavelengths) to/from the CWDM
aggregate signal, in both directions (east/west). There is no pass-through channels.
It is built up on two specular Line Terminal configurations.
The Hub takes place as linear add and drop multiplexer in point-to-point links and ring networks.
This configuration allows the Sub-Network Connection Protection of all the channels.
CMDX1 and CMDX2 mux/demux boards, are available in case of 1-channel and 2-channel CWDM lines
are required.
The Back-to-back terminal is made up of:
– Colored boards (SDH/SONET, DATA)
– two CMDX boards (mux/demux), one per direction.
West line
One fiber pair
n (up to 8)
CWDM signals
The Mux/demux pair
is a CADM board
Technical Handbook Common
Functional Description
Mux/
Demux
n CB
(up to 8)
n (up to 8) added and dropped channels
(B&W User signals)

Figure 38. Back-to-back terminal (Hub) configuration

One fiber pair
Mux/
Demux
CWDM signals
n CB
(up to 8)
Alcatel 1850 TSS-320 Rel. 1.1
8DG 07734 AAAA Edition 01
East line
n (up to 8)
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