From Chapter Two: The appliance computing culture

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?T1″ is an North American telco designation for a single cable provisioned to carry up to 24 concurrent telephone conversations but usually applied to equivalent rate data communications. Since a phone conversation has a digital equivalent rate of 56Kbits per second and requires an 8KBS control channel, a T1 provides for transmission at the rate of 1.536Mbs (=24 x 64) or about 192K characters per second.

North American data transmissions ratings go all the way up to OC/3 - about 173M characters per second. The comparable European designations start at E1 =40 phone line equivalents or about 2.5Mbits/sec.

The European equivalent of a T1 line is an E1.

E1 carries signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps). E1 and T1 lines may be interconnected for international use.

OC-3 is optical lines (fiber optics, typically 62.5nm or 50nm), with other OC cables being OC-12, OC-48 and OC-192. These are used in both the US and abroad (as they also cross the ocean floor).; Posted by: B.O.F.H. Posted on: 09/26/08 You are currently: a Guest | Members login | Terms of Use

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| 09/26/08

I don't know why... Anton Philidor | 09/26/08

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