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Extra resources for Cisco - Introduction to Voice and Telephone Technology 401
Cisco Systems Confidential 36 Variable Delay Components Queuing Delay Queuing Delay Queuing Delay Dejitter Buffer • Queuing delay • Dejitter buffers • Variable packet sizes 401 0985_05f9_c1 73 © 1999, Cisco Systems, Inc. An Example • Assumptions: We have eight trunks We are going to use CS-ACELP that uses 8 Kbps per voice channel Our uplink is 64 Kbps Voice is using a high priority queue and no other traffic is being used 401 0985_05f9_c1 74 © 1999, Cisco Systems, Inc. , Public Frame Relay Svc) Dejitter Buffer 401 0985_05f9_c1 Total 50 msec 110 msec 75 82 © 1999, Cisco Systems, Inc.
An Example • Assumptions: We have eight trunks We are going to use CS-ACELP that uses 8 Kbps per voice channel Our uplink is 64 Kbps Voice is using a high priority queue and no other traffic is being used 401 0985_05f9_c1 74 © 1999, Cisco Systems, Inc. , Public Frame Relay Svc) Dejitter Buffer 401 0985_05f9_c1 Total 50 msec 110 msec 75 82 © 1999, Cisco Systems, Inc. Variable Delay Calculation • We have eight trunks, so in the worst case we will have to wait for seven voice calls prior to ours • To put one voice frame out on a 64Kbps link takes 3msec • 1 byte over a 64Kbps link takes 125 microseconds.
401 0985_05f9_c1 92 © 1999, Cisco Systems, Inc. ) • NT2 Typically a PBX Provides switching functions Handles Layer 2 and Layer 3 protocols 401 0985_05f9_c1 93 © 1999, Cisco Systems, Inc. Access to ISDN • At the S-reference point: RJ-45 (receive and transmit pair) Optional power can be provided for TE devices Distance: 1 Km (1 x TE only), 200 m (8 x TE), 500 m (4 x TE) When more than one TE, wires act as a bus CSMA/CD Limitation: cannot have an extension phone 401 0985_05f9_c1 94 © 1999, Cisco Systems, Inc.