3
61433105L1-5F
Section 61433105L1, Issue 6
C A U T I O N
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
Latching Loopbacks
Latching loopbacks are always enabled on the SLC
series 5 Total Reach DDS-DP.
False Latching Loopbacks Immunity
ADTRAN’s protected Loopback family of channel
unites includes an algorithm compatible with SARTS,
Hekimian, TPI, and other test systems that virtually
eliminates false latching loopbacks. Immunity is
automatically enabled at 64 kbps.
3. INSTALLATION
After unpacking the unit, inspect it for damage. If
damage is discovered, file a claim with the carrier,
then contact ADTRAN. Refer to
Warranty and
Customer Service
.
Compliance
CAUTION
This product is intended for installation in a
restricted access location in a Type B or E
enclosure only.
Max input current @ max load = 165 mA @ -48
VDC.
Max output current @ max load = 41 mA @ -140
VDC. See
Table 2
for Compliance Codes.
Tip/Ring Pair
The DDS-DP plugs directly into a SLC Series 5
channel bank. No special wiring is required. The
2-wire loop uses the T/R (Tip and Ring) of the odd
pair, pins 31 and 32 of the SLC Series 5 backplane.
The DDS-R is not polarity sensitive, therefore the unit
will operate even when the T/R pair is reversed.
Zero Code
When Zero Code is enabled, the DDS-DP allows DS0
bytes of all zeros to enter the T-carrier data stream.
On Alternate Mark Inversion (AMI) facilities, this
function should be disabled. B8ZS carrier facilities
that accommodate 64 kbps clear channel operation do
not require the zero code to be suppressed, therefore
zero code is automatically enabled when the 64 kbps
rate has been selected.
Rate Selection
When 64K (SW2-1) is ON, the DDS-DP operates at
64 kbps clear channel.
When 19.2K (SW2-2) is ON, the DDS-DP operates at
19.2 kbps.
When SW56 (SW2-3) is ON, the DDS-DP enables
Switched-56 operation.
NOTE
Only one rate should be selected. Service rates
of 64 kbps, 19.2 kbps, and Switched-56 are not
supported by the SLC Series 5 BCU. These
operating modes must be provisioned by enabling
switches on SW2. A manual rate setting overrides
BCU rate settings. The DDS-DP does not
support 38.4 kbps.
A/B Signaling
When A/B Signaling (SW2-4) is OFF, the unit derives
signaling from the incoming data stream. When A/B
Signaling is ON, the unit determines the state of the A
and B signaling bits using signals present on the
backplane of the channel bank. This method assumes
that proper signaling has been maintained throughout
network tandems and cross-connect systems.
NOTE
A/B Signaling option is only applicable when
SW56 is selected; otherwise it is a “don’t care.”
Quality Monitor
When Quality Monitor (SW2-5) is ON, the DDS-DP
monitors the incoming 2-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 Abnormal Station Code to the
network. Customer data transmission is automatically
restored when the trouble condition is cleared.
Code
Input
Output
Power Code (PC)
F
C
Telecommunication Code (TC)
–
X
Installation Code (IC)
A
–
Table 2. Compliance Codes
