Perle Systems IOLINK-520 manual CSU/DSU Module, T1/E1 Module

Link Interfaces Reference

CSU/DSU Module:

The CSU/DSU interface module uses a standard RJ45 service connector, pinout specification RJ48S.

CSU/DSU

Figure 3 - 5 Rear View of the CSU-DSU Connector

The LXT411 CSU/DSU link connection is set to operate at 64 Kbps by default. The link may be set to 56 Kbps via the software menus if required.

When two CSU/DSU link routers are to be connected via a leased line in a back to back set-up, the unit must be set to 56 Kbps link speed and a null-modem crossover cable used for the connection.

A DSU/CSU crossover cable would be constructed as follows: 1 --> 7 2 --> 8 7 --> 1 8 --> 2

T1/E1 Module:

The T1/E1 interface module use a standard RJ45 service connector, pinout specification RJ48C.

T1/E1

Figure 3 - 6 Rear View of the T1/E1 Connector

When two T1/E1 routers are to be connected in a back to back set-up, a null-modem crossover cable used for the connection.

A T1/E1 crossover cable would be constructed as follows: 1 --> 4 2 --> 5 5 --> 2 4 --> 1

Pins 1 and 2 are receive (1 = ring, 2= tip) Pins 4 and 5 are transmit (4 = ring, 5= tip)

3.4— IOLINK-PRO & 520 Reference Manual