Determining the Configuration

External Interface Descriptions

The T1 backplane provides a method for extending individual T1 channels from the T1-configured cards to any channel-configured cards in use. Note the following issues regarding the T1 backplane:

Only one T1-configured card may be plugged into each bus on the backplane.
When installing non-T1 cards on the shelf equipped with the T1 interface backplane, ensure that none of the slots to be used are cabled to the T1 interface backplane. If a non-T1 card is installed in a slot that is connected to the T1 backplane, all T1 cards on that bus may fail.
Only one T1 card may be connected (via the B port) to each bus of the T1 backplane, and all SS7 links derived from any particular T1 must be processed on the same shelf on which the incoming T1 is terminated.
Due to cable congestion, Oracle does not recommend use of the T1 cabling backplane on the control shelf.
If the control shelf is used, a maximum of 20 T1 interfaces can be utilized in the control shelf.

Descriptions of the T1 hardware and the procedures for installing the T1 hardware are contained in Hardware Reference and Installation Guide.

The procedure for removing a T1 signaling link is the same as removing an SS7 signaling link, so to remove a T1 signaling link from the database, go to the Removing an SS7 Signaling Link procedure.

Possible Configurations

The T1 backplane was designed to allow the maximum number of possible customer setups. It allows the customer to choose between several levels of diversity and convenience. Configurations depend on the number of cards configured as T1 cards versus the number of cards configured as channel cards. The level of diversity required by the customer also affects the configuration requirements. Note that all signals labeled “T1 input” may be one or two T1 ports depending on the cable used.

Support of Two T1 Ports

The E1/T1 MIM will support two T1 ports, which are independently configurable. On a T1 card, T1 port 1 will support channel cards. The second port of that T1 card will only support up to a maximum of eight time slots and will not support channel cards.

Clocking Options

Each T1 interface must independently operate in one of two clocking modes. When configured as a channel card, a T1 card is required for the channel card’s clocking source.

Slave Timing - The default receive clock on the LIM-T1 card will be used as the source of the transmit clock.
Master Timing - The transmit clock of the LIM-T1 card. The Master Timing feature allows a T1 signaling link to take its high-speed clock reference directly from an external high-speed master clock source.

Support of T1 Framing Options

The T1 interfaces independently support either the SF (superframe format) or ESF (extended superframe format) T1 framing options. Selection of these options is made by the framing parameter of either the ent-t1 or chg-t1 commands.

LIM-T1 Card to Channel Card Interface

Whether the T1 card is operating as a T1 card or a channel card, the card will map any eight channels from the T1 interfaces to an HDLC controller (ports A, B, A1, A2, A3, B1, B2, B3). These eight channels could be dropped either both from T1 port 1 or one from T1 port 1 and the other from T1 port 2. When the T1 card is configured as a T1 card, it will support the external T1 cabling backplane interface from T1 port 1 (T1 port 2 will not have this capability) to additional T1 cards, within the same shelf, configured as channel cards. Idle time slots not assigned to a T1 card or a channel card will be filled with a one’s pattern.

T1 Configuration Form

Use the form provided below to record your T1 configuration. An example of the required input is shown in italics under each column heading.

Table B-3 T1 Signaling Link Configuration Form

Card Location and Port (1201 A)	Timeslot (1)	T1 Number (1)	T1 Card Location (1201)	Adjacent Point Code (4001)	Linkset ( ST1ME )	SLC (1)