Using the V.52 (BER) Test Pattern Generator
To use the V.52 BER tests in conjunction with the Remote Digital
Loopback tests (or with Local Line Loopback tests), follow these
instructions:
1.
Locate the “511/511E” toggle switch on the front panel of the
Compact mDSL Modem and move it UP. This activates the
V.52 BER test mode and transmits a “511” test pattern into the
loop. If any errors are present, the local modem’s red “ER”
LED will blink sporadically.
2. If the above test indicates no errors are present, move the
V.52 toggle switch DOWN, activating the “511/E” test with
errors present. If the test is working properly, the local
modem's red “ER” LED will glow. A successful “511/E” test
will confirm that the link is in place, and that the Compact
mDSL Modem built-in “511” generator and detector are work
ing properly.
NOTE:
The above V.52 BER tests can be used independently
of the Remote Digital Loopback tests. This requires two opera-
tors: (1) to initiate and monitor the tests at the local Compact
mDSL Modem, and (2) to do the same at the remote Compact
mDSL Modem. In this case, the test pattern sent by each
Compact mDSL Modem will not be looped back, but will be
transmitted down the line to the other Compact mDSL Modem.
While one operator initiates test, the other monitors for errors.
25
Compact mDSL Modem
26
Compact mDSL Modem
APPENDIX A
BLACK BOX COMPACT MDU9705A-V35
AND MDU9705A-X21 SPECIFICATIONS
Clocking Modes:
Internal, External, or Receive Recovered
DTE Rate:
All 64k steps from 64 to 2304 kbps
DTE Interface:
V.35 (Compact mDSL Modem), DCE
Orientation;
X.21 (Compact mDSL Modem), DCE or
DTE Orientation depending upon orientation
of pc-board mounted daughter board
DTE Connector:
M/34 Female (Compact mDSL Modem)
D-Sub-15 Female (Compact mDSL
Modem)
Diagnostics:
V52 compliant (511/511E) pattern generator
and detector with error injection mode con-
trolled by front panel switch, Local and
Remote Loopback control by either a front
panel switch or from the DTE interface
LED Status:
The following LEDs are displayed on the
front panel:
DSL Link (Green Active) - DSL Link Active
TD, RD (Yellow/Green) - Idle Yellow
NS (Red Active) - No signal DSL Link
ER (Flashing Red) - CRC error during nor-
mal operation, bit error during pattern gen-
eration test
TM (Active Yellow) - Test Mode Enabled
Configuration:
Externally accessible dip switches or SNMP
managed through mDSL Rack Card
Power:
+5 VDC external desk top power supply, 90-
260VAC, 50-60 Hz (Universal Input), 10W
or -48 VDC
Compliance:
FCC Part 15, CE, CTR1
Transmission Line:
Single Twisted Pair
Line Coding:
CAP (Carrierless Amplitude and Phase
Modulation
Line Rates (DSL line):
144, 272, 400, 528, 784, 1040, 1552, 2064,
2320 kpbs
Line Interface:
Transformer coupled, 1500 VAC isolation
mDSL Physical
Connection:
RJ-45, 2 wire, polarity insensitive pins 4
and 5
Environment:
Operating temperature 0-50°C; humidity 5-
95% non-condensing; altitude, 0-15, 000
feet (0-4600 m)
