Zhone IMACS 8000, Руководство пользователя

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Reference Guide 4-13
Applications Data Modules and Applications
An OCU-DP port may be programmed for OCU mode or CSU mode. OCU mode is the most
common and is used whenever the OCU-DP port attaches to a CSU/DSU over a four-wire
circuit. CSU mode allows the card to be connected directly to the digital network.
Software initiated diagnostics supported by the OCU-DP card include the setting of six
different loop backs. Three of these act on the OCU-DP card itself and are known as local loop
backs and the other three generate loop back patterns to remote devices and are known as
remote loop backs. Among local loop backs, there are three types:
• loop backs of the 4-wire analog interface of the OCU-DP port towards the attached CSU
• loop backs of the 4-wire OCU-DP interface towards the network
• loop backs towards the network at the point where the OCU-DP card interfaces with the
system bus
All three remote loop backs are latching loop backs. These latching loop backs are:
• loop back of the analog interface of the remote OCU-DP device back towards the
network
• loop back of the 4-wire interface of the remote CSU device back towards the network
• loop backs of the 4-wire interface of the local CSU device towards the network.
An OCU-DP port may be programmed to detect and respond to both latching and non-latching
(i.e., alternating) DDS-format OCU loop back codes that are initiated from the remote end of
the circuit. A time-out option authorizes the OCU-DP port to automatically release the loop
back after ten minutes.
4.3.6 DSO-DP Card
The 8000-DS0DP-4P DSO Data Port/G.703 Data Unit (DSO-DP/G.703) is a plug-in user card
for the system. The DSO-DP/G.703 provides a 64 Kbps interface to a DSO of a T1/E1
network. The card supports four (4) ports each of which provide a 64 Kbps interface to a DSO
on a T1 or E1 WAN link. Each DSO-DP/G.703 card can be installed in any User Slot and
provides four (4) DB15 female connectors.
The DSO-DP/G.703 card can be programmed to operate in either DSO-DP mode or in G.703
mode. In G.703 mode, the card supports either co-directional or contra-directional operation
and that option is set-able on a port-by-port basis. In DS0-DP mode, in addition to Transmit
Data and Receive Data, the card can be programmed to either provide a 64 Kbps bit clock and
an 8 kHz byte clock to the attached device or to receive those two clocks from the attached
device.