Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
FUNCTIONAL DESCRIPTION
The following is a basic description of the RFL DS-562NC features. A simplified block diagram of the module
is shown in Figure 15.
MODULE DESCRIPTION OVERVIEW
The RFL DS-562NC Synchronous Data Module provides RFL IMUX 2000 T1/E1 Multiplexers with
synchronous full-duplex data communications at either 56 Kbps or any multiple of 64 Kbps, with a maximum
limit that is dependent upon the multiplexer type or interface I/O type. The DS-562NC can operate up to 1.536
Mbps in T1 Multiplexers, and up to 1.984 Mbps in E1 Multiplexers; unless CAS Mode is used, in which case
the maximum rate is 1.920 Mbps. The RFL DS-562NC operates in terminal or drop and insert systems over
T1/E1 carrier lines and uses RS-449/530/422, CCITT V.35, G.703, X.21/V.11, C37.94 short haul optical fiber,
RFL short haul fiber, and Ethernet LAN interfaces. The RFL DS-562NC can communicate with older RFL DS-
562I modules at 56kbps and 64kbps data rates and occupies only one shelf location. The module can be set up
and interrogated remotely via the SCB of the IMUX 2000. DIP switches enable the user to set up the module
locally. Seven front panel LEDs indicate to the user the status of the module.
This m
odule communicates using one or more bi-directional time slots. When communicating at 56 Kbps the
com
m
unication
protocol includes provisions for programmable addressing to prevent DS0 misconnections. One
of 63 addresses is selectable locally using DIP switches or remotely using software. LEDs indicate when the
addressing feature is enabled, and when the DS-562NC has established valid communications with the
appropriate DS-562NC. As an option the received data may be squelched during loss of valid address. This
option can be selected locally using DIP switches or remotely using software.
NOTE
Channel addressing cannot be used on G.703 and RFL Short Haul Fiber (MA-600) interfaces since
these modules only operates at 64 Kbps.
The RFL DS-562NC allows the selection of local loopback
or rem
o
te loopback functions. Local equipment
loopback (EQLB) takes the data coming in on the 56/N x 64 Kbps I/O port and sends it back out on the same
I/O port. Local payload loopback (PLLB) also referred to as “remote loopback”, echoes the T1/E1 data back to
the source. The loopbacks may be enabled remotely via software or locally by either a front accessible toggle
switch, or when using the RS-449 or RS-530 interface, via pins on the rear panel connector. The local loopback
commands will override any remote (software) loopback commands. The board contains two LEDs to indicate
when either type is enabled.
The RFL DS-562NC ma
y be operated as a DCE or DTE. In DCE mode, the DS-562NC provides the interface
timing to the external customer
equipment; all of the interface modules support this mode. In DTE mode, the
external customer equipment provides the interface timing to the DS-562NC; this externally supplied interface
timing
must
be synchronous with the T1/E1 carrier. The card supports data, clock, RTS, and CTS signals at the
user connector. The CTS is normally a copy of the RTS signal, but as an option can be delayed by
approximately 8 microseconds. Note that only the RS-449, RS-530 and V.35 interfaces currently support the
RTS/CTS handshake function.
RFL DS-562NC RFL Electronics Inc.
July 5, 2012 46 (973)
334-3100
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