often receives BAD FCS errors

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Hi,
   Amazing,it works. Thx a lot. But why does it always appears FCS errors when TE_CLOCK value is MASTER?

> Date: Wed, 20 Apr 2011 17:13:02 +0200
> From: tsearle at gmail.com
> To: asterisk-ss7 at lists.digium.com
> Subject: Re: [asterisk-ss7] often receives BAD FCS errors
> 
> try changing
> 
> TE_CLOCK to slave
> 
> Torrey
> 
> 2011/4/20 ??? <tprax634 at hotmail.com>:
> > Hi,
> >
> > Anybody knows why my mtp2 link works fine but continuously appears BAD FCS
> > errors? What causes this error?
> >
> >
> > Here is my conf:
> > 1.dahdi/system.conf
> >
> > loadzone=us
> > defaultzone=us
> >
> > #Sangoma A102 port 1 [slot:4 bus:4 span:1] <wanpipe1>
> > span=1,1,0,ccs,hdb3,crc4
> > bchan=1-15,17-31
> > mtp2=16
> >
> > #Sangoma A102 port 2 [slot:4 bus:4 span:2] <wanpipe2>
> > span=2,2,0,ccs,hdb3,crc4
> > bchan=32-46,48-62
> > mtp2=47
> >
> > 2.wanpipe/wanpipe1.conf
> >
> > [devices]
> > wanpipe1 = WAN_AFT_TE1, Comment
> >
> > [interfaces]
> > w1g1 = wanpipe1, , TDM_VOICE, Comment
> >
> > [wanpipe1]
> > CARD_TYPE       = AFT
> > S514CPU         = A
> > CommPort        = PRI
> > AUTO_PCISLOT    = NO
> > PCISLOT         = 4
> > PCIBUS          = 4
> > FE_MEDIA        = E1
> > FE_LCODE        = HDB3
> > FE_FRAME        = CRC4
> > FE_LINE         = 1
> > TE_CLOCK        = MASTER
> > TE_REF_CLOCK    = 0
> > TE_SIG_MODE     = CCS
> > TE_HIGHIMPEDANCE        = NO
> > TE_RX_SLEVEL    = 430
> > LBO             = 120OH
> > FE_TXTRISTATE   = NO
> > MTU             = 1500
> > UDPPORT         = 9000
> > TTL             = 255
> > IGNORE_FRONT_END        = NO
> > TDMV_SPAN               = 1
> > TDMV_DCHAN              = 0
> > TE_AIS_MAINTENANCE = NO         #NO: defualt  YES: Start port in AIS Blue
> > Alarm and keep line down
> >                                 #wanpipemon -i w1g1 -c Ttx_ais_off to
> > disable AIS maintenance mode
> >                                                                 #wanpipemon
> > -i w1g1 -c Ttx_ais_on to enable AIS maintenance mode
> > TDMV_HW_DTMF            = NO            # YES: receive dtmf events from
> > hardware
> > TDMV_HW_FAX_DETECT              = NO            # YES: receive fax 1100hz
> > events from hardware
> > HWEC_OPERATION_MODE     = OCT_NORMAL    # OCT_NORMAL: echo cancelation
> > enabled with nlp (default)
> >
> > # OCT_SPEECH: improves software tone detection by disabling NLP (echo
> > possible)
> >
> > # OCT_NO_ECHO:disables echo cancelation but allows VQE/tone functions.
> > HWEC_DTMF_REMOVAL       = NO    # NO: default  YES: remove dtmf out of
> > incoming media (must have hwdtmf enabled)
> > HWEC_NOISE_REDUCTION    = NO    # NO: default  YES: reduces noise on the
> > line - could break fax
> > HWEC_ACUSTIC_ECHO       = NO    # NO: default  YES: enables acustic echo
> > cancelation
> > HWEC_NLP_DISABLE        = NO    # NO: default  YES: guarantees software tone
> > detection (possible echo)
> > HWEC_TX_AUTO_GAIN       = 0     # 0: disable   -40-0: default tx audio level
> > to be maintained (-20 default)
> > HWEC_RX_AUTO_GAIN       = 0     # 0: disable   -40-0: default tx audio level
> > to be maintained (-20 default)
> > HWEC_TX_GAIN            = 0             # 0: disable   -24-24: db values to
> > be applied to tx signal
> > HWEC_RX_GAIN            = 0             # 0: disable   -24-24: db values to
> > be applied to tx signal
> >
> > [w1g1]
> > ACTIVE_CH       = ALL
> > TDMV_HWEC       = NO
> > MTU             = 8
> >
> >
> > --
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> >
> 
> --
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