150
C
HAPTER
4: C
ONFIGURING
P
ATH
B
UILDER
S330/S310 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
Ethernet Port Virtual Circuit Parameters
For Ethernet port virtual circuits you simply set the common
Shaper Number
,
Priority
, and
Early Packet Discard
parameters.
CBR Module Virtual Circuit Parameters
The parameters that appear on the Add Virtual Circuit screen when you select the
CBR module to be a side of a circuit vary, depending on whether you select the
V.35 port or one of the T1/E1 ports. In addition to the common
Shaper Number
,
Priority
, and
Early Packet Discard
parameters, you must set the following
parameters:
Port
— The CBR module port number.
CDV Buffer Size
— The Cell Delay Variation buffer size:
1-24 ms
. Cell delay
variation refers to the spacing between cells. The PathBuilder S330/S310 provides
a buffer to account for cell delay variation and thereby prevent cell loss. If the cell
delay variation exceeds the size of the buffer, however, then you will lose cells. If
your cell loss counts are high, try setting the cell delay variation to a higher value.
Your service provider can tell you the maximum cell delay variation for your
service.
Cell Loss Integ Period
— The amount of time the system will wait before
declaring cell loss state.
Payload
Size/Type
— The ATM payload size and type. For ports other than
structured voice DSX-1 ports, this is a read-only parameter. For structured voice
DSX-1 ports, select
Voice
or
Data
.
■
Set the
Payload Size/Type
to
Voice
to configure a CAS (channel associated
signaling) channel for structured voice. For details, see “Configuring CBR
Circuits for DBA” earlier in this chapter.
■
Set the
Payload Size/Type
to
Data
to configure a CBR circuit for clear channel
signaling. For details, see “Configuring CBR Circuits for Clear Channel
Signaling” earlier in this chapter.
You can also set the
Payload Size/Type
to
Data
to configure CCS (common channel
signaling), but this is not the preferred method. The recommended method for
configuring CCS is to set the CBR
Port Mode
to
Structured Data
. For details, see
“Setting up a PRI PBX Tie Line” earlier in this chapter.
Onhook Detection
— Enables or disables onhook detection. When you enable
onhook detection, bandwidth is automatically reallocated based on the detection
of an on-hook condition, as specified by the signaling type.
Signaling Type
— The signaling application type:
No
Signaling
,
E&M/PLAR
,
FXO-LoopStart
,
FXS-LoopStart
, or
FXO-GroundStart
for CBR T1-DSX; R2 for CBR
E1. You can only modify this field in structured voice mode. In this mode, you can
select any signaling application type except
No
Signaling
. If you try to set the
Signaling
Type
to
No
Signaling
in structured voice mode, you will get an error. In
structured/unstructured data modes, the
Signaling
Type
defaults to
No
Signaling
and cannot be modified.
V.35 Bandwidth
— (serial port only) Speed (derived as n x 56/64K).
