Zhone IMACS 8000, Руководство пользователя

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4-12 Reference Guide
Model No.
Running Head
Data Modules and Applications Applications
4.3.5 OCU-DP Cards
The 8000-OCUDP (Office Channel Unit - Data Port) is used to interface directly to Data
Service Units (DSUs)/Channels Service Units (CSUs) supporting data traffic up to and
including 64Kbps. A four-wire circuit can connect the OCU-DP card to a DSU/CSU that can
be located up to four miles away. In switched 56 Kbps mode, users can access the network on
an as-needed basis by dial-up commands. The system unit must be equipped to provide -48
VDC power to fully support the functionality of the OCU-DP card.
4.3.5.1 OCU-DP Card Models
The Integrated Access System supports three cards for support of external CSU/DSUs that are
stated below:
• 8000-OCUDP-5P Card
• 8000-OCUDP-10P Card
Both OCU-DP cards have RJ48 female connectors.
Each OCU-DP port can be independently programmed to operate at 2.4, 4.8, 9.6, 19.2, and 56
Kbps in either DSO-A, (one channel per DS0) or DS0-B format, which allows multiple data
ports from multiple OCU-DP cards in the system to be mapped into the same DS0 time slot.
If the DS0-B format is selected, then the user specifies the type of DS0-B format required (b-5,
b-10 or b-20) and the sub-rate position that the data port occupied by the data port within the
DS0-B frame.
In switched-56K mode, an OCU-DP port provides a connection for an external Switched-56K
DSU/CSU that will perform all call set-up and dialing functions. The OCU-DP card converts
the call set-up commands into standard signaling and sends the signaling over the WAN
facility.
The OCU-DP cards support a low speed secondary channel that is established in the 8
th
bit
position of the DS0 time slot to which the OCU-DP port is assigned. The secondary channel
can be used for testing and maintenance of the main circuit or for the transmission of other,
independent, low speed data. The specification table shows the secondary channel rates
associated with the standard primary port rates of the OCU-DP card.
On all OCU-DP cards’ performance statistics is collected by the system and are available
through the user interface. Performance statistics include Errored Seconds (any second with
an error), Severely Errored Seconds (any second with an error rate exceeding 10E-3) and
Consecutive Severely Errored Seconds (CSES). They are displayed in hour intervals for up to
24 hours. CSES are counted by the system once ten consecutive Severely Errored Seconds are
logged. The CSES counter stops if the system logs ten consecutive non-Severely Errored
Seconds.