Verilink 1558D (34-00255) Product Manual - Manual (Page 13)

Installation 2-5 1558D APS CSU/DSU
DS0 channel speed assignments are sequentially
assigned beginning with DS0 #1 if SW4, Position
7 is set to the OFF position (contiguous channel
assignment). When SW4, Position 7 is set to ON,
the channels will be assigned in alternate DS0s,
beginning with DS0#1, DS0#3, etc.
ROM Configuration
The 1558D may be configured to boot operational parame-
ters from the internal ROM (read only memory). To config-
ure the 1558D to boot from ROM, set SW1, Position 2 and
SW1, Position 3 to the ON position and SW1, Position 6 to
the OFF position. With these settings, the 1558D will
always boot (at power up) the unit configuration parameters
from the internal ROM settings. The ROM unit parameters
set when the user selects ‘boot from ROM’ are listed below:
• Slave Unit Operation
• B8ZS line coding, Path A and Path B
• ESF framing, Path A and Path B
• Revert mode, Disabled
• Availability timer set to 60 seconds
• Errored seconds set to 20
• Consecutively errored seconds set to 2
• Loss of frame set to Enabled
• Loss of signal set to Enabled
When the 1558D is being configured to boot from ROM the
user must still review and set the manually selected operat-
ing parameters listed below.
• LBO transmit level setting for both NET A and NET B
• 1558D unit address (if optional 1559 manager is installed)
• DSU Operating Speed (56kb - 1.536 Mbps)
• Rate Multiple, 56kb or 64kb
• DS0 Assignment Mode, Contiguous/Alternate
• Flow Control, On/OFF
• Data Invert, Yes/No
RAM Configuration
The 1558D can be optioned to boot all alarm and operating
parameters from the battery backed RAM at power up. To
configure the 1558D for this mode of operation, simply set
SW1, Position 7 to ON, and SW1, Position 8 to OFF. Keep
in mind that the user must still manually configure the fol-
lowing unit operating features:
• LBO transmit level setting for both NET A and NET B
• 1558D unit address (if optional 1559 manager is installed)
• DSU Operating Speed (56kb - 1.536 Mbps)
• Rate Multiple, 56kb or 64kb
• DS0 Assignment Mode, Contiguous/Alternate
• Flow Control, On/OFF
• Data Invert, Yes/No
Manager Configuration
The 1558D may be configured and controlled using the
optional 1559 APSM site manager. The manager, co-located
with one or more 1558D units (up to 56), provides both
local and remote access and control/alarm reporting to one
or more remote locations. When the 1558D has been config-
ured to ‘Boot from Manager’, the 1559 can access and
change all options except the following:
• LBO transmit level setting for both NET A and NET B
• 1558D unit address (if optional 1559 manager is installed)
• DSU Operating Speed (56kb - 1.536 Mbps)
• Rate Multiple, 56kb or 64kb
• DS0 Assignment Mode, Contiguous/Alternate
• Flow Control, On/OFF
• Data Invert, Yes/No
• Boot Mode (Switches, RAM, ROM, Manager)
To configure the 1558D to ‘Boot from Manager’, set S1-7
to OFF and S1-8 to ON. For additional information con-
cerning the use and operation of the 1559 manager, refer to
the TxPORT 1559 APSM reference manual.
Unit configuration of the 1558D APS is now complete. The
final steps to complete installation is to perform the 1558D
preservice testing steps describe in the following sections.
Pre-service Testing
The pre-service test checks the operational integrity of the
1558D unit and the T1 facilities (Net A and Net B). The
local pre-service testing is made independently of any DTE
or T1 connections. The end-to-end testing requires that the
T1 facilities be connected to the 1558D unit.
Local 1558D Test Diagram, Path A and Path B on page 2-
8 illustrates the testing described in the following pre-ser-
vice steps. Pre-service Testing verifies the following:
• Path Integrity for Path A and Path B (local)
• Path Integrity for Path A and Path B (end-to-end)
The following T1 test equipment and miscellaneous cables
will be required to perform the 1558D pre-service tests:
• A Data BERT Test Set with a V.35 Interface
• One V.35 cable (1558 to Test Set)
Before proceeding, the user should read and understand the
background information presented in the following para-
graphs concerning the basic operation theory of an APS ser-
vice (also refer to Figure 3-1 on page 3-2 and Figure 3-4
on page 3-10).