User`s guide

5-4 Preliminary November 23, 1998 MultiVoice Gateway for the MAX— User’s Guide
Configuring the WAN Interfaces
Configuring T1 lines
You cannot use FDL reporting on a line configured for D4 framing. However, you can obtain
D4 and ESF performance statistics in the FDL Stats windows, even if you do not choose an
FDL protocol.
Cable length and the amount of attenuation required
The Length parameter specifies the length of the physical T1 line in feet from the external
Channel Service Unit (CSU) to the MultiVoice Gateway. If the T1 transceiver in the
MultiVoice Gateway does not have an internal CSU, it can connect to a T1 line no longer than
655 feet. Anything of greater length requires an internal CSU. The value should reflect the
longest line length you expect (up to a maximum of 655 feet).
The Buildout parameter specifies the amount of attenuation to apply to the T1 transceiver’s
internal CSU. The amount, if any, depends on the length of the cable between the MultiVoice
Gateway and any repeater from which it might receive the signal. If the MultiVoice Gateway is
too close to the Central Office (CO) or a repeater, you might need to specify some attenuation
to reduce the strength of the signal. Valid values are 0 dB (decibels) through 22.5 dB. Check
with your carrier to determine the correct value.
Clock source for synchronous transmission
The Clock Source parameter determines whether the T1 line can be used as the master clock
source for synchronous connections. In synchronous transmission, both the sending device and
the receiving device must maintain synchronization in order to determine where one block of
data ends and the next begins.
If two Ascend units connect to each other through a crossover cable (with optional T1
repeaters) between their network ports, you must disable this parameter on one unit.
Collecting DNIS and ANI
The Collect DNIS/ANI parameter enables the MultiVoice Gateway to collect the Automatic
Number Identifier (ANI) and the Dialed Number Identification String (DNIS) signals. These
signals are used to support ANI authentication of MultiVoice users and single-stage dialing,
respectively. DNIS and ANI can be collected for three network signal types:
• DTMF tones in T1 inband.
• MF tones in E1 R2.
• D channel messages in T1/E1 PRI or BRI.
The collected DNIS is dialed by the MultiVoice Gateway
Note: To process DNIS and ANI signals, the telephone switch (or PBX) connected to the
MultiVoice Gateway must support DNIS and ANI pass-through signalling. To test whether
your switch supports DNIS and ANI pass-through signalling, use the h323CallDisplay
command. (For information on performing this test see Appendix A, “Troubleshooting.”)
Call-by-Call signalling values (MAX 4000/6000)
The Call-by-Call parameter specifies the service provider’s call-by-call signalling value for
routing calls from a local device to the network through the MultiVoice Gateway. The values
differ by service provider.