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VoIP over frame-relay

Hi,

I am trying to understand the concept/relation of fragmentation and Bc for voice traffic. I understand a Tc value ideal for voice is 10ms. Thus say if we have a CIR = 512kbps then bc can be 5120 and fragment size can be 640bytes

map-class frame-relay ABC

frame-relay cir 512000

frame-relay bc 5120

frame-relay fragment 640

Assuming Tc = 10ms my question are -

1. does the fragment size always be have to the same as Bc ?

- i think no

2. Can the fragment size be smaller that Bc ?

- i think yes

3. Can Bc be smaller than fragment size ?

- not sure

i may be completely wrong. Could somebody please shed some light on this ?

Regards,

Nilesh

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