Frame Relay: Using E1 circuit, the rate can be from 64k to 2mbps.
V24: The router end is a DB50 connector and the external network end is a 25-pin connector.
In asynchronous working mode, the encapsulated Link layer protocol PPP, which supports network layer protocol IP and IPX, has a maximum transmission rate of 115200bps;
In sync, you can encapsulate link layer protocols such as X.25, Frame Relay, PPP, HDLC, slip, and LAPB, and support IP and IPX with a maximum transmission rate of 64000bps.
Transmission distance: related to transmission rate, 2400bps-60m 4800bps-60m; 9600bps-30m; 19200bps-30m; 38400bps-20m; 64000bps-20m; 115200bps-10m; (Computer science)
V35: The router end is a DB50 connector and the external network end is a 34-pin connector.
V35 cables are generally only used for synchronous transmission of data, can be in the interface package X.25, Frame Relay, PPP, SLIP, LAPB and other link layer protocol, Support Network layer protocol IP and IPX.
The v.35 cable transmission (under synchronous mode) is recognized as the highest rate of 2048000bps (2mbps).
Transmission distance: related to the transmission rate, 2400bps-1250m;4800bps-625m;9600bps-312m 19200bps-156m;38400bps-78m;56000bps-60m;64000bps-50m ; 2048000bps-30m.
The following is a description of several common but important control signals in the v.24 and v.35 procedures:
DTR (Data terminal ready, terminal Ready)
The DSR (data Set Ready) is used primarily for negotiation information between transmission devices.
DCD (Data carrier detect) is used to detect the current link state of the device.
RTS (request to send requests to send)
CTS (clear to send purge sent)
BRI: Use rj-45 crystal Head connector. Interface procedures for customized bandwidth of 2b+d, a total of 128kbps.
Ce1: Can use the time slot range is 1~31, the time slot 0 uses in the system synchronization, cannot use in the data transmission. Each logical interface feature is the same as the synchronous serial port, which supports the link layer protocol of PPP, Frame Relay, LAPB and X.25, and supports network layer protocols such as IP and IPX.
The router Ce1/pri interface is a db-15 (PIN) connector, which is either a BNC head or a rj-45 Crystal Head connector at the network end.
Now, generally use 75 European copper shaft cable to 120 euro shielded twisted pair of conversion adapters to connect the use of RJ-45 connector Ce1/pri cable.
PRI: can use 30 of 32 time slots, the other 0 o'clock slots for system synchronization, 15 o'clock slot used as D-channel transmission signaling, can not be used casually.
The PRI interface can provide total bandwidth of 30b+d, total 2048kbps.
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