03-06-2002 08:40 AM - edited 03-01-2019 08:46 PM
Hi-
I have two 2620 router with T1 CSU/DSU. I am trying to connect both router via a crossover cable. The pins outs are 1->4, and 2->5.
On both routers I am seeing alarm & s0/0 is down/down. On one of the routers I am seeing CD light. I am I missing something or is it bad crossover cable.
03-12-2002 10:27 AM
Greetings:
You did not say what protocol you are running. Assuming your cable is good, set one of the CSU's for internal clocking. If you are doing a F-Relay setup, make sure that the serial interfaces are set to keepalive=0 and set your F-Relay map statements to point to the same DLCI on both sides.
If you have done these things, then you will want to verify the cable.
Thanks...Steve
03-12-2002 11:35 AM
Pin out are 1->5 and 2->4. Try that and it should work.
John
03-12-2002 12:29 PM
Actually, 1 -> 4 2 -> 5 is the correct pinout
for T1 Xover.
If the int is down/down remake your cable and post your configs for the ints.
Regards,
Brad
03-13-2002 07:53 AM
T-1 is bipolar, which renders the debate somewhat academic. It is merely the magnitude of the delta (or lack thereof) between the two balanced leads that conveys information. You can never truley invert a T-1.
03-13-2002 08:26 AM
I've always used 1->5, and 2->4 pin outs and worked for me. Also, make sure one of the router is providing clock.
03-16-2002 01:32 AM
ya . chk for the clock setting and also if possible tell what alarm you are getting?
03-15-2002 11:32 AM
Pins 1-4 and 2-5 or 1-5 and 2-4 will both work the same. You need to make sure that one of the routers is supplying clock for the T-1
03-16-2002 05:06 AM
ok - I'm trying the same with two 1602's & frame relay. We named one A and one B - s0 down/down on both routers. Integrated csu alarm light on for both of em. here are the configs and output from show int s0. :
lab a router - show run command:
show run
Building configuration...
Current configuration:
!
version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname lab1602
!
enable secret 5 $1$7FrH$FDLHIzGZMz9A13c27i9yz1
enable password xxxxxx
!
isdn switch-type basic-5ess
!
interface Ethernet0
ip address 10.2.1.2 255.255.255.0 secondary
ip address 10.1.1.1 255.255.255.0
!
interface Serial0
description Circuit ID
no ip address
encapsulation frame-relay
no keepalive
service-module 56k clock source line
service-module 56k network-type dds
!
interface Serial0.1 point-to-point
ip address 10.1.3.1 255.255.255.0
no arp frame-relay
frame-relay interface-dlci 101
!
interface Serial0.2 point-to-point
ip address 10.1.4.1 255.255.255.0
no arp frame-relay
!
interface BRI0
ip address 10.1.2.1 255.255.255.0
!
router rip
network 10.0.0.0
!
router igrp 1
network 10.0.0.0
!
no ip classless
logging buffered
snmp-server community xxxxxx RO
!
line con 0
line vty 0 4
password ccnp
login
!
end
lab a show int s0 command:
lab1602#show int s0
Serial0 is down, line protocol is down
Hardware is QUICC Serial (with onboard CSU/DSU)
Description: Circuit ID
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation FRAME-RELAY, loopback not set, keepalive not set
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/64/0 (size/threshold/drops)
Conversations 0/0 (active/max active)
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 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 207 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=down DSR=down DTR=up RTS=up CTS=up
ok, now 1602b config:
show run
Building configuration...
Current configuration:
!
version 11.1
service udp-small-servers
service tcp-small-servers
!
hostname Router
!
enable secret 5 $1$KDz5$.srEYWfIDmYTP4/qztJ35.
enable password xxxxxx
!
isdn switch-type ntt
!
interface Ethernet0
ip address 10.2.1.1 255.255.255.0
shutdown
!
interface Serial0
no ip address
encapsulation frame-relay
no keepalive
service-module 56k clock source internal
service-module 56k network-type dds
!
interface Serial0.1 point-to-point
ip address 10.1.3.200 255.255.255.0
frame-relay interface-dlci 101
!
interface BRI0
no ip address
shutdown
!
no ip classless
logging buffered
!
line con 0
line vty 0 4
password xxxxxx
login
!
end
and 1602 b show int s0 command:
show int s0
Serial0 is down, line protocol is down
Hardware is QUICC Serial (with onboard CSU/DSU)
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation FRAME-RELAY, loopback not set, keepalive not set
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/64/0 (size/threshold/drops)
Conversations 0/0 (active/max active)
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 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 79 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=down DSR=down DTR=up RTS=up CTS=up
Any help would be appreciated. I tried the regular cat 5 cables supplied with the routers, what we call regular crossover cables, and had a friend lend me T-1 crossover cables. same results with all cables.
the only thing that sticks out to me is DCD=down and DSR=down in all cases.
thanks for any insight :)
03-18-2002 04:43 AM
Are these connected to each othe rwith a cross-over cable? With a 56k you would cross pins 1-7 and 2-8. Also, both are set up as frame relay end devices (DTE) and won't work that way with a cross-over cable. One has to be set up as a frame relay switch (DCE).
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