Because NxDS0 interfaces carry
less bandwidth than a T1 or E1 interface, the buffer size on an NxDS0 interface can be relatively larger, depending on
the number of DS0 channels combined. The maximum delay buffer size
is calculated with the following formula:
Interface Speed * Maximum Delay Buffer Time = Delay Buffer
Size
For example, a 1xDS0 interface has a speed of 64 kilobits
per second (Kbps). At this rate, the maximum delay buffer time is
4,000,000 microseconds. Therefore, the delay buffer size is 32 kilobytes
(KB):
64 Kbps * 4,000,000 microseconds = 32 KB
Table 33 shows
the delay-buffer calculations for 1xDS0 through 32xDS0 interfaces.
Table 33: NxDSO
Transmission Rates and Delay Buffers
Interface Speed
Delay Buffer Size
1xDS0 Through
4xDS0: Maximum Delay Buffer Time Is 4,000,000 Microseconds
1xDS0: 64 Kbps
32 KB
2xDS0: 128 Kbps
64 KB
3xDS0: 192 Kbps
96 KB
4xDS0 Through
7xDS0: Maximum Delay Buffer Time Is 2,000,000 Microseconds
4xDS0: 256 Kbps
64 KB
5xDS0: 320 Kbps
80 KB
6xDS0: 384 Kbps
96 KB
7xDS0: 448 Kbps
112 KB
8xDS0 Through
15xDS0: Maximum Delay Buffer Time Is 1,000,000 Microseconds
8xDS0: 512 Kbps
64 KB
9xDS0: 576 Kbps
72 KB
10xDS0: 640 Kbps
80 KB
11xDS0: 704 Kbps
88 KB
12xDS0: 768 Kbps
96 KB
13xDS0: 832 Kbps
104 KB
14xDS0: 896vKbps
112 KB
15xDS0: 960 Kbps
120 KB
16xDS0 Through
32xDS0: Maximum Delay Buffer Time Is 500,000 Microseconds
