| 摘要 |
<p>The invention concerns a distributed communications system. In particular it concerns a modular system which includes one or more exchange units for installation in a rack at a telephone exchange. Each exchange unit has an exchange line interface, one or more optical fibre bearer cards and one or more service cards to support services to one or more remote units. The system also includes one or more remote units. Each remote unit is enclosed in a sealed housing for installation in a pit or manhole, and has an optical bearer card and remote service cards to provide customer services. The exchange unit is connected to a series of the remote units by a series of optical fibre links which extend between an optical fibre bearer card in each unit. The service cards associated with each optical fibre bearer card in the exchange unit are matched to the service cards of the remote units which are connected in the series to that optical fibre bearer card in the exchange unit.</p> |
