Specifications

RJ21X Connector (Mediatrix 4124) Reference Manual (MGCP/NCS Version)
Mediatrix 4100
203
RJ21X Connector (Mediatrix 4124)
The Mediatrix 4100 uses the RJ21X, or “Amphenol-type”, connector as network interface with the Key Service
Unit (KSU) or PBX Main Distribution Frame. The Mediatrix 4100 can thus be used in a variety of situations:
 It can be directly connected to a PBX via analog lines. These analog lines would be wired in a
RJ21X cable.
 The PBX may have some analog lines connected to the SCN, while other lines could be
connected to the IP network via the Mediatrix 4100.
See “
Placing a Call” on page 4 for a few examples of Mediatrix 4100 use.
Creating a RJ21X Cable
The Mediatrix 4100 can use from 1 to 24 single or multiple-pair circuits bridged to the network or other
connected equipment. These circuits are usually wired in a RJ21X cable and then plugged into the RJ21X
connector of the Mediatrix 4100.
To meet the Class B EMI requirements, a shielded cable and connector shall be used. The shield shall be an
overall aluminium foil and be connected to the connector shield.
The cable may be directly connected to the PBX or cross-connected via a Bix termination and cross-connect
system. In fact, depending on the technician involved, the scenarios may vary.
RJ21X Pinout
Pins 1 (ring) and 26 (tip) of the ribbon connector are considered position 1. Pins 2 (ring) and 27 (tip) are
position 2. This pairing continues through 24 pairs.
Note: Installation of the analog lines via a RJ21X cable shall be done by a qualified technician.
Table 133: RJ21X Pinout
Line Ring Tip
1 (with Bypass) pin1 pin26
2 pin2 pin27
3 pin3 pin28
4 pin4 pin29
5 pin5 pin30
6 pin6 pin31
7 pin7 pin32
8 pin8 pin33
9 pin9 pin34
10 pin10 pin35
11 pin11 pin36
12 pin12 pin37
13 pin13 pin38
14 pin14 pin39
15 pin15 pin40
16 pin16 pin41