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Appendix A Reference Information
Connection Type by Interface Type
A-2
255-700-714R11.0
PacketStar
®
PSAX 1-Port Channelized OC-3/STM-1 CES Module User Guide
, Issue 1
Release 11.0.0
When unacknowledged protocol data units (PDUs), the MaxPD field on the
remote end peer (such as the
NavisCore
™
CBX 500
®
) shows the maximum
number of SSCOP packets transmitted since the last PSAX polling of the peer.
To optimize call performance, the SSCOP Rx Window Size field of the local
ATM interface should be less than the maximum value displayed in the
MaxPD credit window at the remote end of the ATM interface. Otherwise,
the rate at which switched calls can be set and released may be degraded.
On the ATM IISP Interface Configuration window, the maximum credit win-
dow (the SSCOP Rx Window Size field) is configurable with a value up to 32
for all ATM interfaces on the PSAX system. The interfaces of the ATM
switches that are connected to the PSAX system should be configured with
the same values. This method results in 100 percent call completion at a call
setup rate of 60 calls per second using even distribution. If these values are
not configured in this way, calls will be set up at a rate of less than 60 calls
per second.
Note:
Various SSCOP parameter settings determine the maximum credit
window. As a result, you may not be able to directly use these set-
tings.
For more information on the SSCOP parameter, see the Application Note
entitled
Connecting a CBX or GX Switch to a PacketStar
®
PSAX Multiservice Media
Gateway via an ATM Port.
Connection Type by Interface Type
The
PacketStar
®
PSAX Multiservice Media Gateways provide a number of
connection types and interface types to the network as described in
Table A-1. Configuring interfaces and connections are described in the
PacketStar
®
PSAX Connections Provisioning Guide
that can be found on the
PacketStar
®
PSAX Multiservice Media Gateways Product Information Library
CD-ROM.
Table A-1. Connection Type by Interface Type
Interface Type
A
T
M IISP
(Ne
twork/U
ser
)
AT
M
I
M
A
A
T
M PN
NI
1.0
A
T
M PNN
I ov
er VPC
A
T
M UN
I
3.0/3
.1
/4.0
A
T
M V
irtual
Interf
ace
Bri
d
g
e
CAS T
runkLine
Cir
cuit Emul
ation
Frame
R
e
la
y
(
UN
I
,
NNI)
GR-3
03
HDLC Pass-thr
o
ugh
PRI ISDN (Netw
ork
/User)
Te
rminal Em
ulation
Gi
gabi
t Eth
er
n
et Brid
ge
Giga
bit Eth
er
n
et IP
Connection Type
AAL2 PVC Trunk
X X X X X X
AAL2 Channel PVC VCC Connection
*
X X X X X X
ATM-to-ATM virtual channel connection (VCC)
PVC
X X X X X X
ATM-to-ATM virtual path connection (VPC)
PVC
X X X
X
Bridge-to-ATM VCC PVC
X X X X X X X
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