ISO/IEC 8877:1992

NOTE - This Portion of the plug illustrates a structure necessary for securing the cordage and is not pertinent to proper mating with the jack.
Figure 1 - Plug - 8 pole
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Figure 2 - Jack - 8 pole
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See note 2
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7 The 24O min. angle applies only to plugs with front plastic Walls higher than 4,83 mm (0.790 in).
2 Jack contacts may be rectangular with a width of 0,5O (0.079 5) max. and 0,36 (0.014) min.
Figure 4 - Plug/jack contact specification

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Annex A
(informative)
Interface cabling arrangements!
The interface cabling arrangements, implied by the requirements in CCITT Recommendation 1.430, section 4 are
described in this annex. Figure A.l illustrates the cabling arrangements, for the ISDN basic access interface, and
Shows the different Parts of the physical interconnection: “connecting Cords”, “extension Cords” and “interface
ca bles”.
The same contact numbers assigned at the interface (Point IA in CCITT Recommendation 1.430, figure 2/1.430) of
TEs for TRANSMIT and RECEIVE conductor pairs are assigned at the interface (Point IB in CCITT
Recommendation 1.430, figure 211.430) of NTs for RECEIVE and TRANSMIT , respectively, conductor pairs. This
provides for a given conductor to be connected to the same contact in jacks at both ends of interface cables.
However, it means that interface cables are suitable for NT-to-TE and NTi-to-NT2s interconnections only.
For TE-to-TE interconnections, an adapter with a crossover to connect TRANSMIT to RECEIVE is required. Similar
Statements apply to contactslconductors (pairs assigned to contact numbers 1-2 and 7-8) used for optional power
transfer.
As indicated in Recom mendation 1.430, section 4, interface ca bles are termi nated in the same type of con nector
part (jack) at both ends . This means that NTs or TEs may be connect .ed at eith er end of ’ Point-to-Point cables.
Extension Cords have a plug at one end and a jack at the other end. They cannot be used to extend TE connecting
Cords in connections to Passive Bus wiring configurations because the bridging impedance of an extension Cord (of
even a short length) tan adversely affect Operation (including that of other TEs) in Passive Bus configurations. The
length of the extension Cord(s) associated with a TE in Point-to-Point configurations is limited to 25 m.
Connecting Cords provide a plug for connection to an interface cable (or extension Cord). The acceptable maximum
length of such Cords will generally be limited by the need for compliance with transmit and receive-circuit
impedance requirements specified in CCITT Recommendation 1.430, section 8.
While there is no restriction on the minimum length of such Cords in a particular a pplicati on , TEs are
least 5 m in length .
required to include a Cord of at
lt is also significant that, in most ISDN applications, the interface cable will be user’s premises wiring and the jack
must be available in a form suitable for wall mounting. Available assemblies of the specified jack, which are
intended for such mounting, may provide a housing for a suitable mounting of the transmit and receive pair
terminating resistors. As specified in CCITT Recommendation 1.430, figure Ul.430, the terminating resistors must
be located, for Point-to-Point wiring configurations, in or at the jack and must be connected across contact pairs 4-5
and 3-6. For passive bus wiring configurations, the terminating resistors may be mounted in such jack assemblies
located at the ends of the bus.
lt is equally important to recognize that the interface cable may be wired directly to NTs without the interface
connector and with the interchange circuit terminating resistors provided internal to the equipment. This is possible
where the cable is provided in association with or as part of the NT. In such applications, the only interface of
significance (at which the requirements of CCITT Recommendation 1.430 apply) may be at the jack (Point IA in
CCITT Recommendation 1.430, figure Ul.430) for the connection of TEs . In addition, the combination of the NT
connecting Cord and interface cabling may be of zero length.
Another alternative NT connectio
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