AT&T DS1/DMi/ISDN-PRI manual Permitted Cabling Combinations

B-18SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS

System 85 DS1/DMI to System 85 DS1/DMI — Colocated Arrangement

How this connection is made depends on the vintage or suffix of each DS1. The ANN11B or ANN11C line drivers do not comply with FCC emission standards. Therefore, if the ANN11B or ANN11C are used at one or both ends, this connection may only be implemented by using type DCC-5/24-TSA cable.

Type DCC-5/24-TSA cable is required when the ANN11B/C is used. Either PDS compatible or type DCC-5/24-TSA cable is applicable when the ANN11D or later suffix is used.

As a basic guide for the interconnection of any ANN11_ circuit pack, when group 380 cables are used, it is never necessary to determine the group number of the intracabinet cable. Therefore, the use of group 380 cables is the preferred option. When group 380 cables are not used, the interconnect cable used (GR 357 or GR 370) depends on the intracabinet cable used (GR 335-337 or GR 367-369). Refer to table B-1,50-pin(25-pair) Connector Configurations, for additional details. Cable group numbers must be coordinated at both ends. Any mixing of old and new cable groups will prohibit the connection from being established.

All cable groups are from drawing ED1E434-11.

Permitted Cabling Combinations

Using cable GR-380:

ANN11C/D/E↔[335-337] ↔GR-380 ↔ [335-337] ↔ ANN11C/D/E

ANN11C/D/E ↔[335-337] ↔GR-380 ↔ [367-369] ↔ ANN11C/D/E

ANN11C/D/E↔[367-369] ↔GR-380 ↔ [367-369] ↔ ANN11C/D/E

Using old cable groups:

ANN11C/D/E ↔ [335-337] ↔357 ↔[335-337] ↔ ANN11C/D/E

Using new cable groups:

ANN11C/D/E ↔[367-369] ↔370 ↔ [367-369]↔ANN11C/D/E

NOTE: The null modem function must be locally engineered.