nanog mailing list archives
Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that
From: Mark Tinka <mark.tinka () seacom mu>
Date: Tue, 18 Feb 2020 01:37:26 +0200
On 17/Feb/20 22:43, Clayton Zekelman wrote:
A PRI was and still is 23B+D, not 24 2B+D lines.
In Africa (and much of Europe and Asia, I believe), our PRI's were E1's, which was 30B+2D (CCS and CAS protocols), for a total carriage bandwidth of 2.048Mbps. For E1, timeslot 0 is used for clocking and synchronization and is not considered either a B- or D-channel. Timeslot 16 is used for the D-channel (which I believe is timeslot 24 for a T1). In E1, the D-channels can be configured differently depending on which protocol is in use. For example, if you are using SS7 for an E1 PRI, you can have 31B+1D, which means timeslot 16 is not used for signaling. Mark.
Current thread:
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that, (continued)
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Anne P. Mitchell, Esq. (Feb 17)
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Clayton Zekelman (Feb 17)
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that nanog08 (Feb 17)
- Re: [EXTERNAL] Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Gene LeDuc (Feb 17)
- Re: [EXTERNAL] Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Paul Ebersman (Feb 17)
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Brian (Feb 17)
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Ben Cannon (Feb 17)
- Re: Reminiscing our first internet connections (WAS) Re: akamai yesterday - what in the world was that Mark Tinka (Feb 17)