How to check clock sync Serial Speed

Discussion in 'Cisco' started by francesco.trentini@gmail.com, Oct 17, 2005.

  1. Guest

    I've a router 1721 connected via WIC 1T to a serial cable (v35) that
    goes to the modem dce.

    I've bought a 2 mbps contract for this serial line, but i'm in doubt if
    it configured to a lower interface speed ( 1.5 mbps )

    Infact, "show interfaces serial 0" says

    ------------------------------------------------------
    Serial0 is up, line protocol is up
    Hardware is PowerQUICC Serial
    MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    reliability 255/255, txload 195/255, rxload 26/255
    Encapsulation FRAME-RELAY IETF, loopback not set

    [...]

    -------------------------------------------------------

    It says the bandwidth is 1544kbit but should be 2048kbit

    Is it possible to know how the physical serial interface is really
    configured ( if i'm not wrong it should be set to 2.000.000 clock
    speed ) and what clock frequency it receives?

    thanks you much
     
    , Oct 17, 2005
    #1
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  2. <> skrev i en meddelelse
    news:...
    > I've a router 1721 connected via WIC 1T to a serial cable (v35) that
    > goes to the modem dce.
    >


    A T1 line runs at 1544kbit. not 2Mbit. Consult you ISP if your speed is
    wrong.

    --
    Best regards
    Martin Kiefer
    www.kiefer.dk
     
    Martin Kiefer, Oct 17, 2005
    #2
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  3. Guest

    > BW 1544 Kbit
    This is just typed in to the router and bears NO
    relationship to the clock speed on the line.
    If nothing is type in there is a default setting
    that is used.

    The value is used for the xx/255 dislpay and
    for some dynamic routing protocols. EIGRP
    and maybe IGRP (not been around this long enough?).


    On some platforms - but not all

    sh controllers s 0

    displays the actual clock speed as detected on the line.

    Normally you do not need configure clocking, the
    service provider does that. It is CRITICAL that there
    is only one clock for the whole circuit.
     
    , Oct 17, 2005
    #3
  4. Guest

    Ok, can the clock speed provided by the attached dce be esitmated
    reading the register stuff provided issuing "show controllers serial 0
    " ?

    I'm in doubt if the line is really a E1 or if it is configured as T1.

    I include mine, thanks for any clarification about that.

    Is there a guide for interpreting these register data?

    -------------------------------------------------------

    Interface Serial0
    Hardware is PowerQUICC MPC860
    DTE V.35 TX and RX clocks detected.
    idb at 0x80C11658, driver data structure at 0x80C1915C
    SCC Registers:
    General [GSMR]=0x2:0x00000030, Protocol-specific [PSMR]=0x8
    Events [SCCE]=0x0000, Mask [SCCM]=0x001F, Status [SCCS]=0x06
    Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E
    Interrupt Registers:
    Config [CICR]=0x00365F80, Pending [CIPR]=0x00008000
    Mask [CIMR]=0x40204000, In-srv [CISR]=0x00000000
    Command register [CR]=0x600
    Port A [PADIR]=0x0000, [PAPAR]=0x0903
    [PAODR]=0x0000, [PADAT]=0xF6FF
    Port B [PBDIR]=0x0180F, [PBPAR]=0x0E00E
    [PBODR]=0x00000, [PBDAT]=0x3077C
    Port C [PCDIR]=0x000, [PCPAR]=0x000
    [PCSO]=0x020, [PCDAT]=0xFCE, [PCINT]=0x000
    Receive Ring
    rmd(FF002230): status 9000 length 3A address 1E34144
    rmd(FF002238): status 9000 length 2E address 1E39C44
    rmd(FF002240): status 9000 length 2E address 1E35B44
    rmd(FF002248): status 9000 length 2E address 1E32744
    rmd(FF002250): status 9000 length 2E address 1E3A2C4
    rmd(FF002258): status 9000 length 2E address 1E354C4
    rmd(FF002260): status 9000 length 35 address 1E3A944
    rmd(FF002268): status 9000 length 23E address 1E3C9C4
    rmd(FF002270): status 9000 length 3B address 1E3D044
    rmd(FF002278): status 9000 length 23E address 1E32DC4
    rmd(FF002280): status 9000 length 2E address 1E33AC4
    rmd(FF002288): status 9000 length 3B address 1E3C344
    rmd(FF002290): status 9000 length 3E address 1E36EC4
    rmd(FF002298): status 9000 length 35 address 1E33444
    rmd(FF0022A0): status 9000 length 23D address 1E361C4
    rmd(FF0022A8): status B000 length 2E address 1E37544
    Transmit Ring
    tmd(FF0022B0): status 5C00 length 590 address 1E299CA
    tmd(FF0022B8): status 5C00 length 223 address 1E2738A
    tmd(FF0022C0): status 5C00 length 298 address 1E04F4A
    tmd(FF0022C8): status 5C00 length 2C address 1E0290A
    tmd(FF0022D0): status 5C00 length 590 address 1DE712A
    tmd(FF0022D8): status 5C00 length 1F3 address 1DFBCAA
    tmd(FF0022E0): status 5C00 length 2C address 1E0AEEA
    tmd(FF0022E8): status 5C00 length 61 address 1E40D14
    tmd(FF0022F0): status 5C00 length 590 address 1DF1D4A
    tmd(FF0022F8): status 5C00 length 171 address 1E2C66A
    tmd(FF002300): status 5C00 length 590 address 1E0428A
    tmd(FF002308): status 5C00 length 116 address 1DEDD8A
    tmd(FF002310): status 5C00 length 61 address 1E2ACEA
    tmd(FF002318): status 5C00 length 61 address 1E40D14
    tmd(FF002320): status 5C00 length 590 address 1DEF0AA
    tmd(FF002328): status 7C00 length F8 address 1E2B9AA

    tx_limited=1(2)

    SCC GENERAL PARAMETER RAM (at 0xFF003C00)
    Rx BD Base [RBASE]=0x2230, Fn Code [RFCR]=0x18
    Tx BD Base [TBASE]=0x22B0, Fn Code [TFCR]=0x18
    Max Rx Buff Len [MRBLR]=1548
    Rx State [RSTATE]=0x18008440, BD Ptr [RBPTR]=0x2260
    Tx State [TSTATE]=0x18000548, BD Ptr [TBPTR]=0x22C8

    SCC HDLC PARAMETER RAM (at 0xFF003C38)
    CRC Preset [C_PRES]=0xFFFF, Mask [C_MASK]=0xF0B8
    Errors: CRC [CRCEC]=0, Aborts [ABTSC]=0, Discards [DISFC]=0
    Nonmatch Addr Cntr [NMARC]=0
    Retry Count [RETRC]=0
    Max Frame Length [MFLR]=1608
    Rx Int Threshold [RFTHR]=0, Frame Cnt [RFCNT]=36464
    User-defined Address 0000/0000/0000/0000
    User-defined Address Mask 0x0000


    buffer size 1524

    PowerQUICC SCC specific errors:
    1 input aborts on receiving flag sequence
    0 throttles, 0 enables
    0 overruns
    0 transmitter underruns
    0 transmitter CTS losts

    ------------------------------------------



    thank you much
     
    , Oct 18, 2005
    #4
  5. Guest

    > Ok, can the clock speed provided by the attached dce be esitmated
    > reading the register stuff provided issuing "show controllers serial 0
    > "?


    Not as far as I know. when I have seen the clock rate displayed
    it has been pretty clear and IIRC near the top. I know of no
    magic decodes.

    > Is there a guide for interpreting these register data?


    Again not as far as I know. You could always ask TAC,
    however I guess they would be pretty unimpressed.

    Most of it appears to be about the location of memory buffers
    and the like.

    If you really really need to know you will have to get
    a suitable network analyser or an oscilloscope.
     
    , Oct 18, 2005
    #5
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