MDS 05-3627A01, Rev. D
LEDR Series I/O Guide
117
Diagnostics
The T1 line at each end of the link may be tested using a variety of bit
patterns. In normal operation, statistics are stored for any errors occur-
ring at the line interface, such as framing errors, bipolar violations, and
CRC errors.
Data may be looped back at the local port, through the T1 option only,
and at the remote unit. Further, the unit will respond to in-band (SF) and
data link (ESF) loopback codes at the local port.
When in ESF framing mode, the option can automatically generate per-
formance report messages.
The following alarms may be monitored & logged. They may also be
associated with a user-selectable indication (alarm contact or front panel
LED): Remote Loopback, Lost Frame, Lost Signal, Lost Analog Signal,
AIS, RAI (RYEL), MultiFrame RAI, Severely Errored Frame, Frame
Re-Align, MultiFrame AIS, Far End Block Error, Line Code Error, CRC
Errors and Frame Bit Error.
Clocking
The clock source is configurable for network, loopback, and internal
timing, with secondary selections available should the primary source
become faulty. Refer to the discussion of the
clkmode
command
(
) for more information
14.4 Field Installation of the FT1 Interface Board
An “S” Series LEDR radio can be fitted with a Fractional-T1 (FT1) or
Fractional-E1 (FE1)Interface Board (
). The addition of an
FT1/FE1 board enables the radio to operate with a G.703 interface at
speeds up to 768 kbps.
To add the FT1/FE1 Interface Board to an existing LEDR radio trans-
ceiver, follow these steps:
1. Remove the top cover of the radio (4 Phillips screws).
2. Identify the installation area for the Interface Board (See
).
Remove the three Phillips screws on the main PC board which cor-
respond to the mounting holes on the Interface Board.
3. Install the threaded standoff spacers (furnished with the option
board) onto the main PC board in the holes formerly occupied by the
screws. (Note: Washers must not be used between the standoff spac-
ers and either of the PC boards.)
4. Locate connectors J912 and J913 (See
). These connectors
mate with the plugs on the bottom of the Interface board.
