Installation
61292006L1-5C
7
1. Note: Only one bank type can be selected or selection defaults to D4.
2. Error Correction at data rates of 56 kbps and 64 kbps requires two DS0 time slots for data and error-correcting
parity bytes. When SW56 is enabled on the front panel DIP switch, Error Correction should remain in the OFF
position.
3. Latching Loopback is always enabled except when temporarily disabled using the protected loopback features.
4. The A/B signaling option is only applicable when SW56 is selected on the front panel DIP Switch; otherwise it is
a “don’t care.”
Latching Loopback
Latching Loopback is always enabled except when temporarily disabled using the protected
loopback features.
When a data rate of 64 kbps is enabled, placing
SW1-6
to
OFF
permits the TR OCU DP to
respond to the legacy latching loopback sequence, as described in TR62310 and ANSI T1.107.
With a data rate of 64 kbps, with
SW1-6 ON
, the TR OCU DP will enable the ADTRAN
mode.
Table 3. Circuit Board DIP Switch (SW1) Settings
Switch
Function
On/Off
Description
SW1-1
D4 Channel Bank
(Default)
–
Selects the D4 Channel Bank type
(1)
SW1-2
SLC 96 Mode I, III
–
Selects the SLC 96 Mode I, III Bank type
(1)
SW1-3
SLC 96 Mode II
–
Selects the SLC 96 Mode II Bank type
(1)
SW1-4
Zero Code Suppression
On
Off
Ensures pulse density in T-carrier data stream for
rates other than 64 kbps
Disabled for 64 kbps operation; Zero Code
Suppression is automatically disabled for 64 kbps
clear channel operation
SW1-5
Error Correction
On
Enables data integrity across the T-carrier system
(2)
SW1-6
Protected Loopback
On
Enables Protected Loopback mode
(3
)
For more information refer to
SW1-7
Quality Monitor
On
Enables the TR OCU DP to monitor the incoming 4-
wire loop and 4-wire customer interface data for
errors. If excessive errors are detected, the unit
blocks the customer’s data transmission and sends
an abnormal station code (ASC) to the network.
Customer data transmission is automatically
restored when the trouble condition is cleared.
SW1-8
A/B Signaling
On
Off
Enables the TR OCU DP to determine the state of the
A and B signaling bits using signals present on the
backplane on the channel bank. This method
assumes that proper signaling has been maintained
throughout the network tandems and cross connect
systems.
Enables the TR OCU DP to derive signaling from the
incoming data stream.
(4)
