Perle Systems IOLINK-PRO IOLINK-520 - Manual (Page 33)

Link Interfaces Reference
3.4 — IOLINK-PRO & 520 Reference Manual
CSU/DSU Module:
The CSU/DSU interface module uses a standard RJ45 service connector, pinout specification RJ48S.
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.
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)
CSU/DSU
T1/E1