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Community Member

Cisco 2522 router serial 0 and 1 max speed ?

I have a Cisco 2522 at one of our HQ. This router is then linked to our main HQ router (3660) using a 128Kbps lease circuit connected to Serial 0 of 2522. We recently upgrade the link to 1,024Kbps(1 meg) and since then the link goes up and down. Log into the router and found out a lot of carrier transsions. Call the Teleco guys and they said the link is OK.

I have read on the specs of the router that serial 0 and 1 can take up high speed connections. What is the maximum speed the interface can take ?

I ask the Telco guys to put the link back to 128K and it seems to stabilise now.

I have send a 1751 router to that office and will change the connection. The 1Meg link will then connect to the 1751 instead of the 2522 so that I can isolate it.

Please advice


Re: Cisco 2522 router serial 0 and 1 max speed ?

can you paste in a sh ver

Community Member

Re: Cisco 2522 router serial 0 and 1 max speed ?

Assuming S0 is a High Speed Synchronous port then it should be able to cater for speeds up to 2048Mb/s. The sync/async ports on the other hand will only cater for speeds up to 115.2kb/s though.

more info like the config of the S0, sh int s0, sh controllers will be usefull with the 1Mb/s circuit connected.



Community Member

Re: Cisco 2522 router serial 0 and 1 max speed ?

I have put a 1751 router and has stabilise the link Anyway this is the show version

ITC-Western-Ltk-1>sho ver

Cisco Internetwork Operating System Software

IOS (tm) 2500 Software (C2500-I-L), Version 11.2(16), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-1998 by cisco Systems, Inc.

Compiled Tue 06-Oct-98 11:30 by ashah

Image text-base: 0x0302300C, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c)XB2, PLATFORM SPECIFIC RELEASE SOFTWARE)

BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB2, PLATFORM

ITC-Western-Ltk-1 uptime is 1 day, 20 hours, 2 minutes

System restarted by power-on

System image file is "flash:c2500-i-l.112-16.bin", booted via flash

cisco 2522 (68030) processor (revision E) with 8192K/2048K bytes of memory.

Processor board ID 03897823, with hardware revision 00000002

Bridging software.

X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.

Basic Rate ISDN software, Version 1.0.

1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

8 Low-speed serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x102

You can see that there are 2 Serial network interface(s) and 8 Low-speed serial(sync/async) network interface(s)


Re: Cisco 2522 router serial 0 and 1 max speed ?

a low speed serial is only capable up to 128K, However the regual serial interface can suopport up to E1 . try using one of these if they are available.

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