Lucent Technologies FiberReach DDM-2000 - Page 523

363-206-305
Technical Specifications
Issue 3 June 2000
10-49
Signaling Mode
10
Loop start signaling with fast forward disconnect is provided with the channel units
used in the
SLC
Series 5 and
SLC
-2000 systems with the
SLC
-2000 MSDT
feature.
Digital Data Performance
10
The AUA52B OCU (office channel unit) dataport is designed to provide end links
in DDS. These end links have certain features as follows:
■
One 4-wire circuit per plug-in pair.
■
Data rate — 2.4, 4.8, 9.6, 19.2, 56, or 64 kb/s.
■
Error correction. A digital line bit error rate of 10
-3
is improved to 10
-8
for any
data rate without reducing the channel capacity of the bank.
■
Zero Code Allowed option. Allows an all-zero byte to be transmitted toward
the digital line (which must be optioned for B8ZS zero code suppression).
■
Secondary channel. An option which permits a feature of DDS that
provides the customer with a low-speed telemetry channel supplementing
the primary data channel at any data rate. (See RL83-01-163.)
Operations Interfaces
10
This section presents the operation interfaces that are required to support
technician access to the system and allow alarms and status information
generated by the system to be reported. The local operations interfaces include
the craft interface terminal (CIT) interface, the user panel, and the equipment
indicators. The DDM-2000 FiberReach Multiplexer supports a direct serial TBOS
interface
*
and user-definable miscellaneous discretes. Remote office alarms
*
,
parallel telemetry
*
, and TL1/X.25 interfaces are provided by the host multiplexer.
Craft Interface Terminal
10
The system provides an EIA-232-D compatible front access CIT interface
configured as data communications equipment (DCE). The CIT interface provides
data rates of 300, 1200, 2400, 4800, 9600, and 19,200 baud.
The CIT interface operates full duplex using one start bit, eight data bits, and one
stop bit. Table 10-24 describes the pins supported on the CIT interfaces.
* This is not applicable for users of Release 3.0 and later due to the introduction of Target ID
Address Resolution Protocol (TARP) for Operations Interworking (OI).