Greetings,
The 1224 is connected to the TSU100e with a T1x. The cable is cat5 and about 3 feet long. Here's the setup:
When the T1 is up I can ping from tip to tail and everything is cool, then for some unknown reason the T1 goes down. It might be becuase I bumped the cable but I'm not sure...but once it goes down it's a full on production with snake charmers, belly dancers, and tibetin monks to get it back up and I can't figure out why.
Any thoughts or guidance?
The TSU 100e is a layer 1 device. It is providing physical
layer connectivity between the T1 and the V.35 interface.
When the T1 goes down, what alarms or errors are indicated
on the TSU 100e? You can go into the STATUS menu and look at the ACTIVE ALARMS,
as well as NI ERRORS. In the Netvanta 1224 you can do a “show interface” to see
the status of the T1 interface. If there is an LOS alarm, this is “loss of
signal” which means a total disconnect. A red alarm is a loss of framing,
indicating the T1 signal is there but the equipment cannot get frame sync. If
there are alarms, you can try a T1 loopback plug to verify the alarms clear to
a loopback. If they do not, then the cable, the loopback plug, or the T1
interface is bad.
Hope this helps,
Patrick
Hey Patrick, thanks for the quick reply...It's showing LOS now. Thinking it might have been the cable I made a new one (1<>4, 2<>5, 3<>3, 4<>1, 5<>2, 6<>6, 7<>7, 8<>8) this morning and I might have goofed, I'm gonna head home in at 1130 to swap it out for the one I know works.
Here's the TSU info:
TSU > Status > Network Errors shows a continuious * above CRC and BPV and an intermitant * above FER ever ~2-5 seconds
15MIN/ 24HR
%AS = 56.4/ NA
%EF = 1.4/ NA
ES = 501/ NA
SES = 0/ NA
UAS = 392/ NA
HISTORY
15:57 07/02 0.1 CLOCK SLIP
15:57 07/02 0.1 PLL ALARM
15:59 07/02 NI YELLOW ALARM
16:00 07/02 NI YEL ALRM CLEAR
17:16 07/02 NI LINE ON (NI)
17:18 07/02 NI PAYLOAD ON (NI)
17:19 07/02 NI LOOPBACK OFF
17:21 07/02 NI LOOPBACK OFF
17:22 07/02 NI LOOPBACK OFF
17:34 07/02 NI YELLOW ALARM
17:35 07/02 NI YEL ALRM CLEAR
17:46 07/02 1.1 RED ALARM
17:46 07/02 1.1 LOSS OF SIGNAL
17:46 07/02 1.1 FRAME SLIP
17:47 07/02 1.1 FRAME SLIP
17:47 07/02 1.1 FRAME SLIP
17:48 07/02 1.1 FRAME SLIP
17:48 07/02 1.1 FRAME SLIP
17:48 07/02 1.1 FRAME SLIP
17:49 07/02 1.1 FRAME SLIP
Network Configuration
1) Format ESF
2) Code B8ZS
3) Yellow Alarm ENA
4) Transmit PRMs OFF
5) Timing Mode INTERNAL
6) Set Line Build Out 0.0
7) Remote Loopback Det ACCEPT ALL
😎 Bit Stuffing DISABLE
9) TR-08 Options
10) Exit
Command:
Port 0.1 NX/DBU
1)DS0 RATE: 64 KBPS
2)TX CLK CNTRL: NORMAL
3)DATA: NORMAL
4)CTS: NORMAL
5)DCD: NORMAL
6)DSR: NORMAL
7)"0" INHIB: OFF
8)INBAND MODE: OFF
9)TX CLK SOURCE: INTERNAL
Here's the 1224 info
2021_1#show running-config interface t1 1/1 verbose
Building configuration...
!
!
interface t1 1/1
description
framing esf
clock source line
coding b8zs
lbo long 0
fdl none
remote-loopback
remote-alarm rai
alias
snmp trap link-status
no snmp trap threshold-reached
no snmp trap line-status
tdm-group 1 timeslots 1 speed 64
no shutdown
!
2021_1#show running-config interface hdlc 1 verbose
Building configuration...
!
!
interface hdlc 1
description
ip address 10.1.1.2 255.255.255.0
ip proxy-arp
ip ospf authentication-key
ip ospf authentication null
ip ospf message-digest-key 1 md5
ip ospf message-digest-key 2 md5
no ip ospf cost
ip ospf retransmit-interval 5
ip ospf transmit-delay 1
ip ospf priority 1
ip ospf hello-interval 10
ip ospf dead-interval 40
no ip ffe
no ip mcast-stub helper-enable
ip igmp version 2
ip igmp last-member-query-interval 1000
ip igmp query-interval 60
ip igmp query-max-response-time 10
ip igmp querier-timeout 120
no ip igmp immediate-leave
ip route-cache
ip split-horizon
no dynamic-dns
keepalive 10
alias
fair-queue
no hold-queue out
no qos-policy out
max-reserved-bandwidth 75
bandwidth 0
mtu 1500
lldp send-and-receive
lldp send port-description
lldp send system-name
lldp send system-description
lldp send system-capabilities
lldp send management-address
no shutdown
cross-connect 1 t1 1/1 1 hdlc 1
!
end
2021_1#show interfaces t1 1/1
t1 1/1 is DOWN
Transmitter is sending remote alarm
Receiver has loss of signal, loss of frame
T1 coding is B8ZS, framing is ESF
Clock source is line, FDL type is ANSI
Line build-out is 0dB
No remote loopbacks, No network loopbacks
Acceptance of remote loopback requests enabled
Tx Alarm Enable: rai
Last clearing of counters 01:25:26
loss of frame : 1, current duration 01:25:26
loss of signal : 1, current duration 01:25:26
AIS alarm : 0
Remote alarm : 0
DS0 Status: 123456789012345678901234
N-----------------------
Status Legend: '-' = DS0 is unallocated
'N' = DS0 is dedicated (nailed)
Line Status: -- LOS -- Red -- Tx Yellow --
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
Current Performance Statistics:
0 Errored Seconds, 0 Bursty Errored Seconds
0 Severely Errored Seconds, 295 Severely Errored Frame Seconds
295 Unavailable Seconds, 0 Path Code Violations
0 Line Code Violations, 0 Controlled Slip Seconds
0 Line Errored Seconds, 0 Degraded Minutes
TDM group 1, line protocol is DOWN
Encapsulation HDLC (hdlc 1)
0 packets input, 0 bytes, 0 no buffer
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame
0 abort, 0 discards, 0 overruns
0 packets output, 0 bytes, 0 underruns
And here's some info on the 2513 connected to the TSU
2513#show running-config
Building configuration...
Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname 2513
!
aaa new-model
enable password
!
username privilege 15 password 0
!
interface Ethernet0
no ip address
shutdown
!
interface Serial0
ip address 10.1.1.1 255.255.255.0
!
interface Serial1
ip address 10.1.2.1 255.255.255.252
!
interface TokenRing0
no ip address
shutdown
!
no ip classless
ip route 172.20.1.0 255.255.255.0 10.1.1.2
!
line con 0
line aux 0
line vty 0 4
!
end
2513#show interfaces serial 0
Serial0 is down, line protocol is down
Hardware is HD64570
Internet address is 10.1.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input 03:22:33, output 03:23:10, output hang never
Last clearing of "show interface" counters 01:32:43
Input queue: 0/75/0 (size/max/drops); 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)
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
473 input errors, 157 CRC, 0 frame, 0 overrun, 0 ignored, 26 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 29 interface resets
0 output buffer failures, 0 output buffers swapped out
8 carrier transitions
DCD=down DSR=down DTR=up RTS=up CTS=down
2513#show controllers serial 0
HD unit 0, idb = 0xA7990, driver structure at 0xAC718
buffer size 1524 HD unit 0, V.35 DTE cable
cpb = 0xE4, eda = 0xC140, cda = 0xC000
RX ring with 16 entries at 0xE4C000
00 bd_ptr=0xC000 pak=0x0AE470 ds=0xE52EA8 status=80 pak_size=0
01 bd_ptr=0xC014 pak=0x0ADB60 ds=0xE50D10 status=80 pak_size=0
02 bd_ptr=0xC028 pak=0x0AE2A0 ds=0xE527F0 status=80 pak_size=0
03 bd_ptr=0xC03C pak=0x0AF860 ds=0xE57890 status=80 pak_size=0
04 bd_ptr=0xC050 pak=0x0AF690 ds=0xE571D8 status=80 pak_size=0
05 bd_ptr=0xC064 pak=0x0AF120 ds=0xE55DB0 status=80 pak_size=0
06 bd_ptr=0xC078 pak=0x0AE0D0 ds=0xE52138 status=80 pak_size=0
07 bd_ptr=0xC08C pak=0x0AD5F0 ds=0xE4F8E8 status=80 pak_size=0
08 bd_ptr=0xC0A0 pak=0x0AF2F0 ds=0xE56468 status=80 pak_size=0
09 bd_ptr=0xC0B4 pak=0x0AEBB0 ds=0xE54988 status=80 pak_size=0
10 bd_ptr=0xC0C8 pak=0x0AFDD0 ds=0xE58CB8 status=80 pak_size=0
11 bd_ptr=0xC0DC pak=0x0ADD30 ds=0xE513C8 status=80 pak_size=0
12 bd_ptr=0xC0F0 pak=0x0AE810 ds=0xE53C18 status=80 pak_size=0
13 bd_ptr=0xC104 pak=0x0AFC00 ds=0xE58600 status=80 pak_size=0
14 bd_ptr=0xC118 pak=0x0AD7C0 ds=0xE4FFA0 status=80 pak_size=0
15 bd_ptr=0xC12C pak=0x0AD990 ds=0xE50658 status=80 pak_size=0
16 bd_ptr=0xC140 pak=0x0AE640 ds=0xE53560 status=80 pak_size=0
cpb = 0xE4, eda = 0xC800, cda = 0xC800
TX ring with 2 entries at 0xE4C800
00 bd_ptr=0xC800 pak=0x000000 ds=0x000000 status=80 pak_size=0
01 bd_ptr=0xC814 pak=0x000000 ds=0x000000 status=80 pak_size=0
02 bd_ptr=0xC828 pak=0x000000 ds=0x000000 status=80 pak_size=0
409 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
21101 residual bit errors
It looks like both the TSU 100e and the Netvanta 1224 are showing LOS, so the cable is the first thing to check. A loopback on each T1 interface may also be helpful.
I think I figured something out. It appears to be behaving like a timing or timing drift or sync timing drift issue. I found that cycling the physical cable between the TSU100 and 1224 fixes the issue, quickly. It usually takes about 2 or 3 cycles but that takes less than 10 seconds total. Wondering if it might be the TSU100 I first swapped it out for an IQ710 and then for a TSU600. Neither of them seemed to exhibit the issue although I onlly had the 710 in the mix for about 5 min but the 600 has been stable for over 24hrs...I'm gonna flash the TSU100 tonight, hopefully that will stabilize it.
dtdionne,
Were you able to stabilize the unit?
Thanks,
kalync
dtdionne,
I am marking this question as 'Assumed Answered', since there have been no additional follow-up questions. Please mark any replies that you found to be helpful or correct. Let us know if you need any further assistance.
Thank you,
kalync