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T1/E1数字中继接口中RJ48C,RJ48S,RJ48X

RJ48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.一般常见为RJ-48C和RJ-48S,用1/2/4/5针.RJ48口呈“凸”这个形状,线序从左往右为87654321.

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 —

 

RJ48线序:

A端:12345678*12发数据,45收数据
B端:45312678*12收数据,45发数据


实际中,华为数字中继接口RJ48线序:

A端:12345678(1橙白、2橙、3绿白、4蓝、5蓝白、6绿、7棕白、8棕)
B端:21754836



RJ48的自环线缆做法

找一个水晶头,用2根线。自己的1接自己的4,自己的2接自己的5。然后这个水晶头就是一个自环头了。

如果你的接口也是水晶头。只要找一个一一对应的双通头。把2个水晶头都插上就ok了


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RJ48C

UNIVERSAL SERVICE ORDER CODE (USOC): RJ48C

Mechanical Arrangement: Miniature 8-position jack. Typical Usage: 1.544 Mbps digital services. 

Electical Network Connection: T&R, T1 R1, conductors 7 and 8 provide cable shield integrity. 

Conductors 3 and 6 are reserved for future use.

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RJ48S

DDS Telco on RJ45

UNIVERSAL SERVICE ORDER CODE (USOC): RJ48S

Mechanical Arrangement: Miniature 8-position keyed jack. 

Typical Usage: Local area data channels/subrate digital services. 

Electrical Network Connection: One or two line T&R or T&R, T1.

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RJ48X

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Understanding USOC and what those RJ codes really mean. The Universal Service Ordering Code (USOC) system was developed by the Bell System and introduced by AT&TO in the 1970s to connect customer premises equipment to the public network. These codes, adopted in part by the FCC, Part 68, Subpart F, Section 68.502, are a series of Registered Jack (RJ) wiring configurations for telephone jacks that remain in use today.

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RJ48 is a registered jack. It is used for T1 and ISDN termination and local area data channels/subrate digital services. It uses the 8 position modular connector.

RJ48C and RJ48X Wiring

Pin Pair Signal

1 R RX Ring

2 T RX Tip

3 reserved

4 R1 TX Ring

5 T1 TX Tip

6 reserved

7 shield

8 shield

RJ48C is commonly used for T1 lines and uses pins 1, 2, 4 and 5.

RJ48X is a variation of RJ48C that contains shorting blocks in the jack so that a loopback is created for troubleshooting when unplugged by connecting pins 1 and 4, and 2 and 5.

RJ48S is typically used for local area data channels/subrate digital services, and carries one or two lines. It uses a keyed variety of the 8P8C modular connector.

RJ48 connectors are fastened to STP (Shielded Twisted Pair) cables, not the standard UTP (Unshielded Twisted Pair) CAT-(1-5).

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RJ-48C/X 8 position modular jack. Pins 1-2 & 4-5

Typical use: DS1/T1 circuit hand off

.

Pins 1 & 2 CSR Receive from Network

Pins 4 & 5 CSR Trnasmit to Network

Pins 7 & 8 provide cable shield integrity

RJ-48C Does not place circuit into a mechanical loopback upon removal of customer supplied 8 pin modular plug. Typically associated with T1 NIU(Smartjacks) RJ-48X Places circuit into an immediate mehanical loopback (Shorting ofpins 1 & 4, 2 & 5) towards network.

 

RJ-48S: 8 position modular jack. Pins 1-2 & 7-8

Typical use: DDS (All rates) circuithand off. Also is the pin out configuration on Analog Data circuit hand offs from NCTE  equipment

station mountings .

Pins 1 & 2: Customer Transmit to the Network

Pins 7 & 8: Customer Receive from the Network

 

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The RJ48C & X interface code is used at DS1 (T1) network interfaces using pins 1-2 (CPE Receive from the Network) & 4-5 (CPE Transmit towards the network.

The RJ48C "jack" interface is non-looping. That is, unlike the RJ48X jack that provides an immediate hard wire TX/RX loopback when the 8 pin plug from the connecting cable is removed, the RJ48C interface does not.

The 48C is typically found on T1 NIU's (Smartjacks). With some exceptions, as in the Verizon New Englans area, a RJ-48X (Auto-looping) interface is more commonly found.

The RJ48S interface is found on DDS 4 wire hand CPE offs. The pins outs for a RJ48S: PINS 1-2 (CPE Transmit to the network), PINS 7-8 (CPE Receive from the network)

The 48S is generally not configured for automatic loopback upon reoval of the 8 pin plug. However is some rather rare ILEC applications it can be found so configured.

 


T1/E1数字中继接口中RJ48C,RJ48S,RJ48X
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