Installation manual

Part No. T0001-43, Rev B
February, 2003
Known Software Limitations Page 50 of 99
Vanguard 6455 Conversion Options in Vanguide Builder
When creating an image for the Vanguard 6455 using the Vanguide builder, the
LLC-TR and LLC-FR LLC-to-SDLC Conversion options do not appear under the
BSC-to-SNA Conversion option. Only LLC-ETH appears and this is automatically
selected. (DRFaa19586)
Workaround: If the user wishes to create a Vanguard 6455 image that supports either
BSC 3270 to SNA Conversion or BSC 2780 to SNA Conversion that runs over a
LLC Token Ring session or LLC Frame Relay session, the user should:
1) Select BSC 3270-to-SNA Conversion or BSC 2780-to-SNA Conversion from the
BSC-to-SNA Conversion Options
2) Then select LLC Token Ring Conversion and/or LLC Frame Relay Conversion
from the IBM SNA Features list.
Vanguard 340 Series Audio on the FXS port
Passing 6.3k audio on three of the four ports on the quad FXS card causes MIPS
errors. MIPS errors are causing static on the output audio. (DRCaa23051)
Workaround: At present, there is no workaround.
Alarms Can Indicate Poor Voice Quality - Vanguard 6400 Series
If you are running G.729 (8kbps), you might see the MED level alarm reported:
VOICE-125 DEBUG INFO: OP_ALARM_NFY: Error_indication 0, Error_code c.
This could indicate poor voice quality. (DRCaa21755)
Workaround: If this alarm message appears and you are experiencing voice quality
problems, run G.723 (6.3kb).
Vanguard 340 Quad FXS Board Failure
A board failure occurs when you place a call between any voice port and a quad FXS
voice port, and then enter the diagnostics menu and initiate a Voice Port Loopback
test while the call is up. The quad FXS board fails with a background diagnostics
failure. (DRCaa23031)
Workaround: At present, there is no workaround.
Vanguard 340, Vanguard 6400 Series - Rx Offhook/Onhook Filter Timer
The Rx Offhook/Onhook Filter Timer is not working correctly on the Quad FXS
card. (DRCaa23046)
Workaround: At present, there is no workaround.
Vanguard Data Compression Not Supported in ATM Bypass Stations
LCON's connected to ATM stations via PVC connections will not work properly
with Vanguard's Frame Data compression. (DRFaa21038)
Workaround: LCON frame data compression is supported through SVC connection
via FRST module to ATM station.
Vanguard V90 Cannot Establish a PPP connection over a V23
Modulation Mode
V23 Modulation Mode is selectable on a PPP modem port, but it is not supported.
(DRCaa23442)
Workaround: Select a faster modulation mode for PPP.