Patch 86241-06 For Rapier Switches
25
Patch 86241-05 for Software Release 2.4.1
C613-10340-00 REV E
Diagnostic loopback is shown in Figure 3 on page 25. In this loopback mode
the transmit signal is connected straight to the receive signal.
Figure 3: Diagnostic Loopback.
In C-bit parity mode it is also possible for the switch to request a loopback at
the far end. This is shown in Figure 4 on page 25. This is achieved using the
FEAC channel. The switch can also respond to remote loopback requests via
the FEAC channel from the far end. This results in a near end Line Loopback
(see above).
Figure 4: Remote Loopback.
Note that it is possible to configure near end local and remote loopbacks at the
same time.
DS3 Configuration
The DS3 interface on the switch is automatically configured by the software
modules when the switch sets up. Certain aspects of the DS3 signal can be
altered to allow the switch to connect to another vendor’s equipment via the
DS3 interface.
The configuration of the DS3 interface can be changed with the command:
SET DS3=instance [CLOCK={LOOP|INTERNAL}] [CMTCE={ON|OFF}]
[DIRECTION={TRANSMIT|RECEIVE}] [EIC=equipment-id]
[FAC=facility-id] [FDET={ON|OFF}] [FIC=frame-id]
[GENNO=generator-id][LIC=location-id] [PARAM15=threshold]
[PARAM24=threshold] [PORT=port-id] [PRIM15=threshold]
[PRIM24=threshold] [UNIT=unit-id] [TYPE=[{PID|ISID|TSID}]
The CLOCK parameter specifies the clock source for the DS3 interface. The
default is LOOP timing where the clock is derived from the received DS3
signal. If INTERNAL is selected the DS3 transmit signal is timed using an
internal clock.
The CMTCE parameter specifies whether the terminal-to-terminal
path-maintenance link is switched on. When CMTCE is set to OFF the
maintenance link is switched off and the C-bits in M-subframe 5 are all set to
one. If CMTCE is set to ON the maintenance link is switched on. The path
Far End
RX
TX
TX
RX
DS3 NSM
DS33
Far End
RX
TX
TX
RX
DS3 NSM
DS34
