2
61220010L2-5, Issue 3
61220010L2-5C
2. OPTIONS
Options and rate are selected with the front panel DIP
switches as shown in Figure 1 and listed in
Table 1.
Customer Interface Transmit Line Build Out
When -10 dB (SW1-1) is ON, the IDSL OCU-R
transmits a -10 dB AMI signal across the 4-wire
customer interface toward the CSU/DSU. When OFF
is selected the unit transmits a 0 dB AMI signal
toward the CSU/DSU.
2-wire Integrated Services Digital Network (ISDN)
U-interface to the traditional 4-wire DDS signal for
presentation to the customer.
The IDSL OCU-R is a digital network interface
device located at the customer premises point-of-
demarcation. In addition to terminating the ISDN
U-interface, the IDSL OCU-R functions as a
regenerative loopback device supporting Telco-
generated testing. The IDSL OCU-R unit is
available in T200 mechanics and can be optioned for
0 or -10 dB output toward the customer.
Figure 2
illustrates the IDSL OCU-R Circuit Diagram. The
IDSL OCU-R is powered from -120 Vdc constant
voltage supplied by a U-BR1TE with PWR, or -48
Vdc provided by a locally powered T200 compatible
mounting.
Features
• 2-wire DDS deployment provided over a
U-interface.
• Dual powering capability; Locally powered by
-48 Vdc provided by mounting assembly or by
-120 Vdc from a U-BR1TE with PWR.
• DB-9 craft interface access for provisioning,
testing, and performance monitoring.
• Frame IQ/ADS-6 provide physical layer and
Frame Relay PM and inband PM access
respectively.
• Protected loopback prevents false latching
loobpack at 64 kbps.
• Switch selectable data rate including subrates,
19.2 and 56 kbps rates, including secondary
channel, and 64 kbps clear channel capability.
• LED indicators for operational status.
• T200 mechanics.
• Transmits Abnormal Station Code upstream
during out-of-service 4-wire customer loop
condition.
Figure 2. IDSL/DDS Circuit Diagram
T-Carrier
Channel Bank
2-Wire Loop
4-Wire Customer
Interface
DSU/CSU
IDSL OCU-R
T/R Pair
Customer Premises
U
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Table 1. Options
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