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Chapter 5:
Overview
The OCM supports two basic types of Dual Channel module: Dual Data modules and High Speed
Data modules. Each type has a variety of hardware versions to provide the necessary interface.
The Dual Data Channel (DDC) modules support only EIA/TIA-232-E applications at a maximum
rate of 38.4 kbps on each of its two channels. The two data channels share a common DB-25
connector and must be routed to the first TMS node together on the same subaggregate. There are
two versions of the Dual data Channel module:
•
Dual Channel module 232 (Part No. 036P413-001) is used in most applications.
•
Dual Channel module 232 with RTS Delay (Part No. 036P413-003) is required for some
sync polling applications. This version is identified on the TMS Controller as Feature
Revision 2.
The High-Speed Data Channel (HSDC) modules support EIA/TIA-232-E, V.35, EIA/TIA-422
(V.11) and EIA-423 electrical interfaces through a DB-25 physical connection. Any required
alterations to this physical connection are accommodated via cable adapters. The HSDC supports
synchronous, asynchronous, isochronous, and transition-encoded data, as well as supporting all of
the functionality associated with the UDC in its normal application. The maximum synchronous
data rate supported by the HSDC module is 1.536/1.920 Mbps.
Table 5-2
lists the technical specifications for all versions of the HSDC module.
Table 5-3
lists the technical specifications for all versions of the DDC module.
Table
5-4,
Table
Table
5-8,
Table
Options
The onboard options are typically set at the factory to match your network operation. Check these
settings when you first install the unit. You need not repeat the procedure unless you change your
network. The figures listed below show option switches and headers in their normal or default
(factory shipped) positions.
Figure 5-1
shows the location and function of switches and headers on the Dual and High Speed
Data Channel modules.
1. Examine the module by checking the option switches and/or headers on the modules.
2. When you are satisfied that the option settings are correct, install the modules in the shelf
following the directions below.
036R340-000
Issue 16
Data Channel Modules
5-5,
Table 5-6
and
Table 5-7
5-9,
Table
5-10,
Table
5-11,
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
lists pinouts for the DDC.
Table 5-12
and
Table 5-13
list pinouts for the HSDC.
5-1
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