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smart serial

manumohan200
Level 1
Level 1

‎04-20-2004 07:45 AM - edited ‎03-02-2019 03:07 PM

I have connected a 2600 series router with a 2500 series router using back-to-back serial cables..I have used a smart serial cable at 2600 router end and a DB-60 pin serial cable at the 2500 router end.My 2600 router end is the DCE end.The problem is that the line protocol is down always.Please help.My router outputs are given below.

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

2500#show interfaces serial 0

Serial0 is up, line protocol is down

Hardware is HD64570

Internet address is 11.0.0.5/8

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input never, output 00:00:29, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/2/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1158 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

44 packets output, 1267 bytes, 0 underruns

0 output errors, 0 collisions, 25 interface resets

0 output buffer failures, 0 output buffers swapped out

26 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

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

2600#show interfaces serial 0/2

Serial0/2 is up, line protocol is down

Hardware is PowerQUICC Serial

Internet address is 11.0.0.2/8

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input never, 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: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

76 packets output, 1818 bytes, 0 underruns

0 output errors, 0 collisions, 31 interface resets

0 output buffer failures, 0 output buffers swapped out

53 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Labels:
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5 Replies 5

smif101
Level 4
Level 4

‎04-20-2004 08:54 AM

The other thing we would need to see here is the show controllers command to ensure that the interfaces are indeed DCE on the 2600 and DTE on the 2500. The other thing is that you need to have the clockrate command entered on the DCE side, like clockrate 64000. After that you should try using hardware loopbacks to ensure that your cables and interfaces are good.

0 Helpful

manumohan200
Level 1
Level 1
In response to smif101

‎04-21-2004 06:06 AM

Could you tell me how to do hardware loopbacks ? I had given clock rate at the DCE interface.By the output of show interfaces serial we can see that all DCD DTR RTS CTS DSR are up.So there shouldn't be any physical problem ?

2500#show controllers serial 0

HD unit 0, idb = 0x28C50C, driver structure at 0x28D900

buffer size 1524 HD unit 0, V.35 DTE cable

cpb = 0x1, eda = 0x5140, cda = 0x5000

RX ring with 16 entries at 0x4015000

00 bd_ptr=0x5000 pak=0x2A0C80 ds=0x4018908 status=80 pak_size=0

01 bd_ptr=0x5014 pak=0x2A0F5C ds=0x4018FC4 status=80 pak_size=0

02 bd_ptr=0x5028 pak=0x2A1238 ds=0x4019680 status=80 pak_size=0

03 bd_ptr=0x503C pak=0x2A1514 ds=0x4019D3C status=80 pak_size=0

04 bd_ptr=0x5050 pak=0x2A17F0 ds=0x401A3F8 status=80 pak_size=0

05 bd_ptr=0x5064 pak=0x2A1ACC ds=0x401AAB4 status=80 pak_size=0

06 bd_ptr=0x5078 pak=0x2A1DA8 ds=0x401B170 status=80 pak_size=0

07 bd_ptr=0x508C pak=0x2A2084 ds=0x401B82C status=80 pak_size=0

08 bd_ptr=0x50A0 pak=0x2A2360 ds=0x401BEE8 status=80 pak_size=0

09 bd_ptr=0x50B4 pak=0x2A263C ds=0x401C5A4 status=80 pak_size=0

10 bd_ptr=0x50C8 pak=0x2A2918 ds=0x401CC60 status=80 pak_size=0

11 bd_ptr=0x50DC pak=0x2A2BF4 ds=0x401D31C status=80 pak_size=0

12 bd_ptr=0x50F0 pak=0x2A2ED0 ds=0x401D9D8 status=80 pak_size=0

13 bd_ptr=0x5104 pak=0x2A31AC ds=0x401E094 status=80 pak_size=0

14 bd_ptr=0x5118 pak=0x2A3488 ds=0x401E750 status=80 pak_size=0

15 bd_ptr=0x512C pak=0x2A3764 ds=0x401EE0C status=80 pak_size=0

16 bd_ptr=0x5140 pak=0x2A3A40 ds=0x401F4C8 status=80 pak_size=0

cpb = 0x1, eda = 0x5800, cda = 0x5814

TX ring with 1 entries at 0x4015800

00 bd_ptr=0x5800 pak=0x000000 ds=0x4000EBC status=80 pak_size=22

01 bd_ptr=0x5814 pak=0x229A98 ds=0x400124C status=80 pak_size=22

0 missed datagrams, 0 overruns

0 bad datagram encapsulations, 0 memory errors

0 transmitter underruns

0 residual bit errors

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

2600#sh controllers serial 0/2

Interface Serial0/2

Hardware is PowerQUICC MPC860

DCE V.35, clock rate 64000

idb at 0x8157DC18, driver data structure at 0x81584024

SCC Registers:

General [GSMR]=0x2:0x00000030, Protocol-specific [PSMR]=0x8

Events [SCCE]=0x0300, Mask [SCCM]=0x001F, Status [SCCS]=0x02

Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E

Interrupt Registers:

Config [CICR]=0x00367F80, Pending [CIPR]=0x00000200

Mask [CIMR]=0x10200040, In-srv [CISR]=0x00000000

Command register [CR]=0x680

Port A [PADIR]=0x4400, [PAPAR]=0xFFFF

[PAODR]=0x0000, [PADAT]=0x8ACE

Port B [PBDIR]=0x07B0F, [PBPAR]=0x0B00E

[PBODR]=0x0000E, [PBDAT]=0x33E6D

Port C [PCDIR]=0x00C, [PCPAR]=0x000

[PCSO]=0x2E0, [PCDAT]=0xCF0, [PCINT]=0x00F

tx_limited=1(2)

SCC GENERAL PARAMETER RAM (at 0x68013E00)

Rx BD Base [RBASE]=0x2A30, Fn Code [RFCR]=0x18

Tx BD Base [TBASE]=0x2AB0, Fn Code [TFCR]=0x18

Max Rx Buff Len [MRBLR]=1548

Rx State [RSTATE]=0x0, BD Ptr [RBPTR]=0x2A30

Tx State [TSTATE]=0x0, BD Ptr [TBPTR]=0x2AB0

SCC HDLC PARAMETER RAM (at 0x68013E38)

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]=0

User-defined Address 0000/0000/0000/0000

User-defined Address Mask 0x0000

buffer size 1524

PowerQUICC SCC specific errors:

0 input aborts on receiving flag sequence

0 throttles, 0 enables

0 overruns

0 transmitter underruns

0 transmitter CTS losts

0 aborted short frames

0 Helpful

manumohan200
Level 1
Level 1
In response to smif101

‎04-21-2004 06:07 AM

Could you tell me how to do hardware loopbacks ? I had given clock rate at the DCE interface.By the output of show interfaces serial we can see that all DCD DTR RTS CTS DSR are up.So there shouldn't be any physical problem ?

2500#show controllers serial 0

HD unit 0, idb = 0x28C50C, driver structure at 0x28D900

buffer size 1524 HD unit 0, V.35 DTE cable

cpb = 0x1, eda = 0x5140, cda = 0x5000

RX ring with 16 entries at 0x4015000

00 bd_ptr=0x5000 pak=0x2A0C80 ds=0x4018908 status=80 pak_size=0

01 bd_ptr=0x5014 pak=0x2A0F5C ds=0x4018FC4 status=80 pak_size=0

02 bd_ptr=0x5028 pak=0x2A1238 ds=0x4019680 status=80 pak_size=0

03 bd_ptr=0x503C pak=0x2A1514 ds=0x4019D3C status=80 pak_size=0

04 bd_ptr=0x5050 pak=0x2A17F0 ds=0x401A3F8 status=80 pak_size=0

05 bd_ptr=0x5064 pak=0x2A1ACC ds=0x401AAB4 status=80 pak_size=0

06 bd_ptr=0x5078 pak=0x2A1DA8 ds=0x401B170 status=80 pak_size=0

07 bd_ptr=0x508C pak=0x2A2084 ds=0x401B82C status=80 pak_size=0

08 bd_ptr=0x50A0 pak=0x2A2360 ds=0x401BEE8 status=80 pak_size=0

09 bd_ptr=0x50B4 pak=0x2A263C ds=0x401C5A4 status=80 pak_size=0

10 bd_ptr=0x50C8 pak=0x2A2918 ds=0x401CC60 status=80 pak_size=0

11 bd_ptr=0x50DC pak=0x2A2BF4 ds=0x401D31C status=80 pak_size=0

12 bd_ptr=0x50F0 pak=0x2A2ED0 ds=0x401D9D8 status=80 pak_size=0

13 bd_ptr=0x5104 pak=0x2A31AC ds=0x401E094 status=80 pak_size=0

14 bd_ptr=0x5118 pak=0x2A3488 ds=0x401E750 status=80 pak_size=0

15 bd_ptr=0x512C pak=0x2A3764 ds=0x401EE0C status=80 pak_size=0

16 bd_ptr=0x5140 pak=0x2A3A40 ds=0x401F4C8 status=80 pak_size=0

cpb = 0x1, eda = 0x5800, cda = 0x5814

TX ring with 1 entries at 0x4015800

00 bd_ptr=0x5800 pak=0x000000 ds=0x4000EBC status=80 pak_size=22

01 bd_ptr=0x5814 pak=0x229A98 ds=0x400124C status=80 pak_size=22

0 missed datagrams, 0 overruns

0 bad datagram encapsulations, 0 memory errors

0 transmitter underruns

0 residual bit errors

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

2600#sh controllers serial 0/2

Interface Serial0/2

Hardware is PowerQUICC MPC860

DCE V.35, clock rate 64000

idb at 0x8157DC18, driver data structure at 0x81584024

SCC Registers:

General [GSMR]=0x2:0x00000030, Protocol-specific [PSMR]=0x8

Events [SCCE]=0x0300, Mask [SCCM]=0x001F, Status [SCCS]=0x02

Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E

Interrupt Registers:

Config [CICR]=0x00367F80, Pending [CIPR]=0x00000200

Mask [CIMR]=0x10200040, In-srv [CISR]=0x00000000

Command register [CR]=0x680

Port A [PADIR]=0x4400, [PAPAR]=0xFFFF

[PAODR]=0x0000, [PADAT]=0x8ACE

Port B [PBDIR]=0x07B0F, [PBPAR]=0x0B00E

[PBODR]=0x0000E, [PBDAT]=0x33E6D

Port C [PCDIR]=0x00C, [PCPAR]=0x000

[PCSO]=0x2E0, [PCDAT]=0xCF0, [PCINT]=0x00F

tx_limited=1(2)

SCC GENERAL PARAMETER RAM (at 0x68013E00)

Rx BD Base [RBASE]=0x2A30, Fn Code [RFCR]=0x18

Tx BD Base [TBASE]=0x2AB0, Fn Code [TFCR]=0x18

Max Rx Buff Len [MRBLR]=1548

Rx State [RSTATE]=0x0, BD Ptr [RBPTR]=0x2A30

Tx State [TSTATE]=0x0, BD Ptr [TBPTR]=0x2AB0

SCC HDLC PARAMETER RAM (at 0x68013E38)

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]=0

User-defined Address 0000/0000/0000/0000

User-defined Address Mask 0x0000

buffer size 1524

PowerQUICC SCC specific errors:

0 input aborts on receiving flag sequence

0 throttles, 0 enables

0 overruns

0 transmitter underruns

0 transmitter CTS losts

0 aborted short frames

0 Helpful

Pavel Bykov
Level 5
Level 5
In response to manumohan200

‎04-21-2004 08:34 AM

Could this possibly be due to your IP addressing? Maybe you should post running configs of both.

0 Helpful

smif101
Level 4
Level 4
In response to manumohan200

‎04-21-2004 10:40 AM

The other thing you might want to check too is on the cables you want to make sure that they are both balanced or unbalanced. You cant mix and match the two. If you want to do a hardware loopback here is what you do. On the DCE cable loop TD to RD which is pins 2 to 3 and 14 to 16 on a 25 pin connector and if you have a 37 pin connector loop 4 to 6 and 22 to 24. This should bring up the interface up and up. On the DTE cable for a 25 pin connector loop the same pins plus 24 to 17 and 11 to 9. You might get a clock issue if you don't let Send Timing passthrough from the DCE to the DTE so that Transmit data can be sent out, but you will have to figure that one out, a lot easier if you have a break out box or patch panel. By the way the control signals are not needed for a sync circuit and really only used for async. Most of time you would just loop those pins back to its mate.

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