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Optical transmission equipment with broadband access and integrated
service access has become the cosset in the most recent trend of
development. On one hand, products based on the PDH technique, which
cost less than nine hundred USD, exhibit supreme inexpensiveness; on
the other hand, the optical transmission equipment that develops on the
basis of SDH technique, more often than not, is required by customers
to be equipped with Ethernet interface or video frequency interface.
As a typical PDH equipment, OM8E1PCM, produced by Heng Guang
Technologies, Co., Ltd  has integrated eight E1 channels, one
10/100BASE-T Ethernet channel, one NX64bps, V.35 channel and PCM30 with
30 channels. However, the exquisite equipment featured by its 2U height
and 19- inch width costs only 1000 odd USD. (Get more details in
www.pcm30.com) Sometimes, designers have to consider to realize the
functions of VDF, DDF and ODF on the PCM, so as to provide the most
customized and convenient product to clients. Such equipment is various
and multiform in configuration and modality, which includes the
European 7R series and 19-inch structure.
At the same time, SDH equipment with E1 channel, 1000M Ethernet
interface and multi-channel 100M Ethernet interface has been becoming
more and more popular, while broadband transmissions will usually adopt
auto-dynamic distribution manner, such as Resilient Packet Ring RPR
technique.
In conclusion, low-priced optical equipment will be developed towards
integrated service access. In addition to E1, E2, E3, T1, T2, T3 data,
Ethernet data (such as 10Base-T, 100Base-T, 1000Base-T, 10/100
auto-adaptation Ethernet), V.35 data of G.703, V.11/V.24 data, video
data, and even the SCADA system is about to be able to transmitted in
single or double optical fibers.