Nortel Remote Gateway 9150 Installation And Administration Manual page 415

June 2005
Remote Gateway 9150
System expansion worksheet
Number of trunk interface modules needed (continued):
14 Calculate the number of B-channels required for simultaneous calls in host-
controlled mode.
Each B-channel can support one MCA call, or up to eight simultaneous voice
calls using G.729A compression (where each call is compressed to 8 Kbps).
However, when using G.729A compression, the first B-channel can support
only six simultaneous calls because 16 Kbps are required for transporting call
signaling data for the entire Remote Gateway 9150 unit (and all of its connected
stations) to the host PBX.
Line 5: ________ + ((# of simultaneous calls: _______ * 8 Kbps) +
16 Kbps) / 64 = __________
Round up the result to a whole number.
15 Calculate the number of B-channels required for both locally controlled and
host-controlled calls. Add lines 13 and 14.
If the result is greater than 8, then call blocking must be implemented, or the
number of simultaneous local calls must be reduced.
Recalculate lines 10, 13, 14, and 15.
16 Calculate the number of trunk interface modules required for local calls.
Divide line 15 by 2. If the result contains a fraction, round it up to the
next whole number.
Line 15: __________ / 2 = ____________
17 How many trunk interface modules are already installed in the
Remote Gateway 9150 unit?
18 Calculate the number of trunk interface modules you need to purchase.
Subtract line 17 from line 16.
Note: A maximum of four trunk interface modules can be installed in the
Remote Gateway 9150 unit.
Remote Gateway 9150 Installation and Administration Guide
Planning forms
Page 3 of 4
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