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An ATM switching node has a queuing resource (230) connected to an ATM switch core (30). The queuing resource provides centralized queuing for ATM cells destined for routing through the ATM switch core to plural output links. The ATM switch core routes an ATM cell destined for any output link requir

An ATM switching node has a queuing resource (230) connected to an ATM switch core (30). The queuing resource provides centralized queuing for ATM cells destined for routing through the ATM switch core to plural output links. The ATM switch core routes an ATM cell destined for any output link requiring queuing to the centralized queuing resource. ATM cells for output links not requiring queuing are not directed to the queuing resource. The queuing resource has a link multiplexer (280) for each output link which is handled by the queuing resource. Each link multiplexer has both a first stage (304) and a second stage (302). The second stage comprises plural queues (312) for storing ATM packets and a second stage multiplexer (314) for selecting the ATM packets stored in the plural queues of the second stage for transmission to the first stage. The first stage comprises plural queues (320) for storing ATM cells and a first stage multiplexer (330) for selection of ATM cells including ATM cells formed of multiplexed ATM packets of the second stage for discharge from the queuing resource. The centralized and selective queuing resource obviates the necessity for queuing at each terminal board connected to the ATM switch core.

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An ATM switching node has a queuing resource (230) connected to an ATM switch core (30). The queuing resource provides centralized queuing for ATM cells destined for routing through the ATM switch core to plural output links. The ATM switch core routes an ATM cell destined for any output link requir

An ATM switching node has a queuing resource (230) connected to an ATM switch core (30). The queuing resource provides centralized queuing for ATM cells destined for routing through the ATM switch core to plural output links. The ATM switch core routes an ATM cell destined for any output link requiring queuing to the centralized queuing resource. ATM cells for output links not requiring queuing are not directed to the queuing resource. The queuing resource has a link multiplexer (280) for each output link which is handled by the queuing resource. Each link multiplexer has both a first stage (304) and a second stage (302). The second stage comprises plural queues (312) for storing ATM packets and a second stage multiplexer (314) for selecting the ATM packets stored in the plural queues of the second stage for transmission to the first stage. The first stage comprises plural queues (320) for storing ATM cells and a first stage multiplexer (330) for selection of ATM cells including ATM cells formed of multiplexed ATM packets of the second stage for discharge from the queuing resource. The centralized and selective queuing resource obviates the necessity for queuing at each terminal board connected to the ATM switch core. elements; wherein a center of rotation of the platen roller is offset along a direction toward the second side of the base from a line extending perpendicular to the surface portion of the base on which the printing heating elements are disposed. 6. A line thermal printer according to claim 1; further comprising a platen roller mounted for undergoing rotation to transport the printing sheet from the first side of the base to the second side of the base while pressing the printing sheet against the surface of the base in the vicinity of the printing heating elements; wherein a center of rotation of the platen roller is offset along a direction toward the second side of the base from a line extending perpendicular to the surface portion of the base on which the printing heating elements are disposed. 7. A line thermal printer according to claim 1; further comprising sheet guides disposed on the first side of the base for guiding side edges of the printing sheet. 8. A line thermal printer comprising: a thermal head comprised of a base having a first side and a second side opposite the first side, at least one heating element disposed on a surface portion of the base, and at least one driver integrated circuit extending from the second side of the base for driving the heating element; and a platen roller mounted for undergoing rotation to transport a recording medium over the heating element from the first side to the second side of the base, the platen roller having a center of rotation which is offset along a direction toward the second side of the base from a line extending perpendicular to the surface portion of the base on which the heating element is disposed. 9. A line thermal printer according to claim 8; further comprising a pair of guides disposed at the first side of the base for guiding the recording medium when the recording medium is transported by the platen roller. 10. A line thermal printer according to claim 8; further comprising a case supporting the thermal head and the platen roller, the case having a pair of guide members disposed at the firs t side of the base of the thermal head for guiding the recording medium when the recording medium is transported by the platen roller. 11. A line thermal printer according to claim 8; wherein the heating element is disposed at a distance of at least 7 mm from an end of the base at the first side thereof. 12. A line thermal printer according to claim 8; wherein the driver integrated circuit is covered by an encapsulating resin. 13. A line thermal printer according to claim 12; wherein the encapsulating resin protrudes from the surface of the base at the second side thereof. on. 3. An ink ribbon cassette according to claim 2, wherein the shaft is rotatable around an axis. 4. An ink ribbon cassette according to claim 1, wherein the connecting portion consists of a pair of connecting members connecting end portions of the first and second accommodating portions, the second support portion consisting of a wall portion partially connecting the pair of connecting members. 5. An ink ribbon cassette according to claim 1, wherein the first support portion comprises a shaft connecting a side plate portion of the cassette case and a side surface portion of the first accommodating portion. 6. An ink ribbon cassette according to claim 1, wherein the connecting portion comprises a pair of connecting members connecting end portions of the first and second accommodating portions, the second support portion comprising a wall portion partially connecting the pair of connecting members. 8, 20000700, Kostelnik et al., 341/118; US-6169424, 20010100, Kurd, 327/053