RJ45接头:
用于以太网(Ethernet 10/100/1000M UTP/STP接口),常用于5类非屏蔽双绞线.RJ-45也用于ISDN等其它接口,针脚定义不同.
RJ48接头:
用于连接T1,E1串行线路,通常采用屏蔽双绞线;RJ-48还可以支持PIN3,PIN6做接地连接.
RJ45和RJ48线序相同,都是从左往右为87654321,但信号定义不同:
RJ45:
10/100M用1/2/3/6针. 1000M用全部8根针.
RJ48:
一般常见为RJ-48C和RJ-48S,用1/2/4/5针.
CT1/PRI-CSU (RJ-48C)信号定义如下,
RJ-48C Pin Description
1 Receive Ring
2 Receive Tip
4 Ring
5 Tip
对于T1/E1 Trunk and Digital Voice Port (RJ-48) Pin1 Signal
1 RX + (input)
2 RX - (input)
3 —
4 TX + (output)
5 TX - (output)
6 —
7 —
8 —
参考资料:
E1(2M传输链路)和shdsl/hdsl/sdsl一样都是最后一公里的传输技术.
数字数据网(Digital Data Network)是利用数字信道传输数据信号的数据传输网,从本质上来说,是一种电路交换网络。
FR是一种分组交换网络技术。可以划分虚电路。
可 以将DDN、FR、ATM等都看做骨干网技术。DDN结点机、FR交换机、ATM接入交换机这些设备是各自网络的最边缘设备。从这些设备到用户都可能会使 用到E1、SHDSL、HDSL、SDSL等最后一公里的传输技术。由于FR、ATM本身支持PVC,相应地在做点到多点的接入时,不需要使用信道化 E1。对于e1来说,一般是光纤到用户,从光端机出来bnc接口。可以转换为RJ48的接口。最高速率为2Mbps,是一条时分线路。又称为信道化E1。
上路由器的接法有两种:
1、用BNC-E1线缆(这里的E1端包括:RJ48、DB15等多种接口形式) 直接接E1模块
2,如果用WIC-1T模块,那么就用一个G.703-----v.35的协议转换器后用V。35线缆接WIC---1T模块。
shdsl/hdsl/sdsl都是用户数据线路,一般使用一对或两对电话线到用户,接口为rj11或rj48。最高速率可以达到2M bps或更高。虽然xdsl技术可以达到2M的速率,但目前我还没听说过可以在dsl线路上跑信道化E1的.
Table 26: RJ-48 Connector to RJ-48 Connector (Straight) Pinout
RJ-48 Pin (on T1/E1 PIC)(Data numbering form)RJ-48 Pin(Data numbering form)Signal
1 1 RX, Ring, - 2 2 RX, Tip, + 4 4 TX, Ring, - 5 5 TX, Tip, + 3 3 Shield/Return/Ground 6 6 Shield/Return/Ground 7 No connect No connect 8 No connect No connect 9 No connect No connect 10 No connect No connect 11 No connect No connect 12 No connect No connect 13 No connect No connect 14 No connect No connect 15 No connect No connect
Table 27: RJ-48 Connector to RJ-48 Connector (Crossover) Pinout
RJ-48 Pin (on T1/E1 PIC)(Data numbering form)RJ-48 Pin(Data numbering form)Signal
1 4 RX/Ring/- <-->TX/Ring/- 2 5 RX/Tip/+ <-->TX/Tip/+ 4 1 TX/Ring/- <-->RX/Ring/- 5 2 TX/Tip/+ <-->RX/Tip/+ 3 3 Shield/Return/Ground 6 6 Shield/Return/Ground 7 No connect No connect 8 No connect No connect 9 No connect No connect 10 No connect No connect 11 No connect No connect 12 No connect No connect 13 No connect No connect 14 No connect No connect 15 No connect No connect
Table 28: RJ-48 Connector to DB-15 Connector (Straight) Pinout
RJ-48 Pin (on T1/E1 PIC)(Data numbering form)DB-15 Pin(Data numbering form)Signal
1 11 RX/Ring/- <-->RX/Ring/- 2 3 RX/Tip/+ <-->RX/Tip/+ 4 9 TX/Ring/- <-->TX/Ring/- 5 1 TX/Tip/+ <-->TX/Tip/+ 3 4 Shield/Return/Ground 6 2 Shield/Return/Ground 7 No connect No connect 8 No connect No connect 9 No connect No connect 10 No connect No connect 11 No connect No connect 12 No connect No connect 13 No connect No connect 14 No connect No connect 15 No connect No connect
Table 29: RJ-48 Connector to DB-15 Connector (Crossover) Pinout
RJ-48 Pin (on T1/E1 PIC)(Data numbering form)DB-15 Pin(Data numbering form)Signal
1 9 RX/Ring/- <-->TX/Ring/- 2 1 RX/Tip/+ <-->TX/Tip/+ 4 11 TX/Ring/- <-->RX/Ring/- 5 3 TX/Tip/+ <-->RX/Tip/+ 3 4 Shield/Return/Ground 6 2 Shield/Return/Ground 7 No connect No connect 8 No connectNo connect
9 No connect No connect 10 No connectNo connect
11 No connect No connect 12 No connectNo connect
13 No connect No connect 14 No connectNo connect
15 No connect No connect