Уважаемый All!
Из чего вычисляется available bandwidth на сериале? И почему он может быть меньше чем реальная полоса? Производительности циски должно быть вроде достаточно.

sh int ser 0/1:0
Serial0/1:0 is up, line protocol is up
  Hardware is GT96K Serial
  Description: XXXXXXXXX
  Internet address is xxx.xxx.xxx.xxx/30
  MTU 1500 bytes, BW 512 Kbit, DLY 20000 usec,
     reliability 236/255, txload 32/255, rxload 107/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1788
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/937 (size/max total/threshold/drops)
     Conversations  0/256/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 384 kilobits/sec
  5 minute input rate 215000 bits/sec, 54 packets/sec
  5 minute output rate 65000 bits/sec, 76 packets/sec
     1640085 packets input, 914896913 bytes, 0 no buffer
     Received 2430 broadcasts, 0 runts, 506 giants, 0 throttles
     246591 input errors, 246591 CRC, 212914 frame, 78065 overrun, 0 ignored, 125695 abort
     2901971 packets output, 390470795 bytes, 0 underruns
     0 output errors, 0 collisions, 5 interface resets
     0 output buffer failures, 0 output buffers swapped out
     33 carrier transitions
  Timeslot(s) Used:1-8, SCC: 0, Transmitter delay is 0 flags

Хотя при этом задействовано в потоке 8 тайм-слотов:
controller E1 0/1
channel-group 0 timeslots 1-8