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DPP Product Guide DPP001 and up
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DPP Communication
DPP-to-HOC communication
Overview
The HOC, located at a central collection point, uses a prearranged polling
schedule for contacting the DPP and requesting transmission of data. Polling
schedules are a function of the expected traffic at the various DPP sites. Data
retrieval is accomplished in accordance with Bellcore X.25 (BX.25) level 3
protocol specifications.
Establishing a polling link
The process by which a HOC polls call record blocks from a DPP requires a
series of communication signals to pass between the two devices. The first step
to establish a link is to set up machine/ machine security parameters and consists
of assigning a specific identity to the DPP and the device(s) authorized to access
it. Once security data has been established, the DPP can be accessed only by
an authorized device.
The first level of security consists of an exchange of security passwords
between DPP and HOC. The HOC initiates this level of security by sending
DPP a unique ten digit numeric sequence known as the collector password.
This password communicates the identity of the outside device to the DPP.
The default password supplied the HOC is 0320 215801. When DPP receives
this password, it responds by sending a unique ten digit numeric password,
revealing its identity to the outside device and establishing the set of
conditions necessary for information transmission. The default password for
DPP is 0380 312967.
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