4-25
VU-ACD™/100 Maintenance Guide – Host/DOS
Troubleshooting
Table 4.8: Performance Indicators For MPC Link Occupancy
Group
Register
Log Reports
ROAPPL
ROAPLOGA
ROAPFLOG
ROAPIC
ROAPOG
RO101
RO101
RO103
RO103
ROMISC
ROMLOGA
ROMFLOG
ROMTERM
RO101
RO101
RO104
ACDMISPL
MISTRANS
MISLOST
MISQUSAG
None
None
None
4.2.6.2
Evaluating MPC Data Link Performance
The data link between the DMS-100 and the VU-ACD/100 host operates at 4800 or 9600 bps. At 9600
bps, with an approximate message size of 40 bytes, an MPC link will support up to 13 messages per
second. As call traffic increases, the number of data links should be increased as necessary to support the
increased number of ACD event messages. An Enhanced MPC (EMPC) card operates at 19200 bps
supports approximately 26 messages per second (40 bytes/message).
?
Perimeter Technology Product Support recommends operating the data link at
4800 bps unless the call volume warrants operating at 9600 bps. Experience with
MPC and EMPC data links indicates that the frequency of error correction
failures increases dramatically at 9600 bps.
Two MPC links are provided for each MPC card; however, ACD MIS and NACD applications use only
one link for each card. Multiple links require translations datafill and ACD configuration changes,
because ACD link partitioning is tied to datafill configuration.
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The Memotec SPP830 Packet Assembler/Disassembler (PAD) limits the link to 4800 bps
from switch to PAD and 9600 bps from PAD to VU-ACD/100. The Memotec SPP800
supports 9600 bps all the way through.
4.2.6.3
Performance Calculations
The maximum capacity of the data link in terms of call attempts per hour (CA/hr) is calculated as
follows:
(Bytes/Msg) (Msgs/Sec) (3600 Sec/Hr)
= Calls/Hr (CA/hr)
Bytes/Call
The calculation to determine the number of links required follows:
MIS Link CA/hr
= Number of Links (round up)
Maximum Link CA/hr rate
Calculate the number of links required. Compare the result to the number of links currently provisioned.
If necessary, increase the number of links.