[c-nsp] Channelized E1 - serial interface output rate problem

[ekko neko]

Hello to all

I have a problem with serial interface that is channel-group on E1 
channelized card.

Channel group has assigned timeslots, but bitrate on interface (on show 
interfaces, and
as a result from SNMP query) is higher than

number_of_timeslots x 64 kbps

Here is example:

Serial0/15:3 is up, line protocol is up
  Hardware is DS-E1
  Internet address is ------------/30
  MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,                            
<--- here is BW 128 Kbit
     reliability 255/255, txload 187/255, rxload 95/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:05, output 00:00:06, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 579120
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  1 minute input rate 48000 bits/sec, 14 packets/sec
  1 minute output rate 226000 bits/sec, 42 packets/sec            <----- 
here output bitrate is problem
     35931760 packets input, 2226760469 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 1 giants, 0 throttles
     832 input errors, 24 CRC, 340 frame, 0 overrun, 0 ignored, 467 abort
     75978254 packets output, 3670704995 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions no alarm present
  Timeslot(s) Used:25-26, subrate: 64Kb/s, transmit delay is 0 flags   <--- 
2 timeslots assigned

Anyone could tell me why this is happening??
In this example bitrate is almost 100k higher, but there is cases where is 
much more.
Please help

Thank you in advance.
nekko

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