Zhone Technologies 900 - Manual (Page 73)

Data Cards IMACS System Release 5.1.6 2-7
SRU Card SRU Card User Screens and Settings
on an ADPCM card) and hlink (a proprietary format used when far end of the circuit has an
ADPCM card while the near end does not).The adpcm frame uses a 24 kbps portion of the
ADPCM engine.
RATE
The Rate setting allows you to select the rate in kilobits per second (kbps) for data
transmission. The selection will change depending upon the framing mode and interface
selected. Figure 2-4 shows the bandwidth available for each selection.
The maximum total bandwidth of any SRU card cannot exceed 115.2 kbps.
The maximum bandwidth of the card depends upon the mode of operations for each port. The
maximum bandwidth for the sync Interface setting is 115.2 kbps and the host will not allow
more than this to be assigned.
The maximum bandwidth for async and v.14 is harder to compute because the computation
depends upon the amount of data being sent.
The async ports have a minimum multiplication factor of 1.2 times a sync port, and v.14 has
a multiplication factor of 1.6 times that of a sync port. Using the Delay Optimization feature
will also degrade the maximum bandwidth by a factor of 1.5 times the maximum bandwidth
figure.
These computation factors suggest a maximum of 96 kbps (96 kbps x 1.2 = 115.2 kbps) for
async ports and 72 kbps (72 kbps x 1.6 = 115.2 kbps) for v.14 ports. However, because of the
nature of async and v.14 data transmission, these limits are not fixed because the user will not
be transmitting data at the full rate. The Delay Optimization feature also degrades the
maximum bandwidth by a factor of 1.5 times the total bandwidth. BERT adds another 2x
multiplication factor to the data rates shown above.